Pub Date : 1988-10-01DOI: 10.1088/0305-4608/18/10/003
M. Trhlík, B. Sedlak, A. L. Erzinkyan, G. Gurevich, V. P. Parfenova, S. Topalov, P. Malinský, V. Pavlov
The low-temperature nuclear orientation of 54Mn in Pt99Fe1 and Pt99.95Fe0.05 has been studied in the temperature range 12-50 mK and in the external magnetic field range 0-1.2 T. The strong temperature and external magnetic field dependence of the effective field Beff on 54Mn has been observed even in the range where the host itself is magnetically saturated. This behaviour is interpreted by noncollinearity of the Mn magnetic moments with respect to the macroscopic magnetisation direction.
{"title":"Observation of Mn spin canting in PtFe alloys at low temperatures","authors":"M. Trhlík, B. Sedlak, A. L. Erzinkyan, G. Gurevich, V. P. Parfenova, S. Topalov, P. Malinský, V. Pavlov","doi":"10.1088/0305-4608/18/10/003","DOIUrl":"https://doi.org/10.1088/0305-4608/18/10/003","url":null,"abstract":"The low-temperature nuclear orientation of 54Mn in Pt99Fe1 and Pt99.95Fe0.05 has been studied in the temperature range 12-50 mK and in the external magnetic field range 0-1.2 T. The strong temperature and external magnetic field dependence of the effective field Beff on 54Mn has been observed even in the range where the host itself is magnetically saturated. This behaviour is interpreted by noncollinearity of the Mn magnetic moments with respect to the macroscopic magnetisation direction.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91519087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-10-01DOI: 10.1088/0305-4608/18/10/018
D. Wegner
The recovery of silver cold-worked at room temperature was investigated by means of positron lifetime spectroscopy. At temperatures between 370 K and 470 K, a recovery stage occurs which is indicated by the decrease of a long lifetime ( tau 2=190(3)ps) intensity. In contrast to vacuum-annealed silver, the samples heated in an oxygen atmosphere exhibit an antirecovery stage above the solubility temperature of oxygen in silver: the intensity of tau 2 reincreases to some 80% above T approximately=500 K. This stage is attributed to the trapping of recrystallisation-induced vacancies at impurity oxygen molecules. To some extent, these complexes are thermally stable up to 1070 K.
{"title":"Positron lifetime studies on the recovery of plastically deformed silver: the influence of oxygen","authors":"D. Wegner","doi":"10.1088/0305-4608/18/10/018","DOIUrl":"https://doi.org/10.1088/0305-4608/18/10/018","url":null,"abstract":"The recovery of silver cold-worked at room temperature was investigated by means of positron lifetime spectroscopy. At temperatures between 370 K and 470 K, a recovery stage occurs which is indicated by the decrease of a long lifetime ( tau 2=190(3)ps) intensity. In contrast to vacuum-annealed silver, the samples heated in an oxygen atmosphere exhibit an antirecovery stage above the solubility temperature of oxygen in silver: the intensity of tau 2 reincreases to some 80% above T approximately=500 K. This stage is attributed to the trapping of recrystallisation-induced vacancies at impurity oxygen molecules. To some extent, these complexes are thermally stable up to 1070 K.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"107 1-2","pages":"2291-2302"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72591746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-10-01DOI: 10.1088/0305-4608/18/10/017
M. Trhlík, B. Sedlak, J. Englich, S. Kapusta, M. Rotter, T. Lešner, P. Čížek, M. Finger, É. Kisdi-Koszó, A. Lovas
The hyperfine field and nuclear spin-lattice relaxation of 60Co in the glassy alloy Co3.1Fe80.5B16.4 have been studied by low-temperature nuclear orientation technique. The thermal cycling method has been used for relaxation measurement. In comparison with the crystalline Fe matrix, the nuclear spin-lattice relaxation of 60Co in the glassy alloy has been found to be five times faster and shows no dependence on external magnetic field in the range 0.1-1.1 T. Weger's mechanism is proposed to play a crucial role in the nuclear spin-lattice relaxation in this material.
{"title":"Nuclear spin-lattice relaxation of 60Co in the glassy alloy Co3.1Fe80.5B16.4 studied by low-temperature nuclear orientation","authors":"M. Trhlík, B. Sedlak, J. Englich, S. Kapusta, M. Rotter, T. Lešner, P. Čížek, M. Finger, É. Kisdi-Koszó, A. Lovas","doi":"10.1088/0305-4608/18/10/017","DOIUrl":"https://doi.org/10.1088/0305-4608/18/10/017","url":null,"abstract":"The hyperfine field and nuclear spin-lattice relaxation of 60Co in the glassy alloy Co3.1Fe80.5B16.4 have been studied by low-temperature nuclear orientation technique. The thermal cycling method has been used for relaxation measurement. In comparison with the crystalline Fe matrix, the nuclear spin-lattice relaxation of 60Co in the glassy alloy has been found to be five times faster and shows no dependence on external magnetic field in the range 0.1-1.1 T. Weger's mechanism is proposed to play a crucial role in the nuclear spin-lattice relaxation in this material.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"70 1","pages":"2283-2289"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86283690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-10-01DOI: 10.1088/0305-4608/18/10/001
S. J. Collocott
The specific heat of a holmium single crystal has been measured in the range 0.6 to 5 K, and is compared with previously reported measurements made on polycrystalline material. For the holmium single crystal, a value of the electric specific heat coefficient, gamma , of 2.1+or-1 mJ mol-1K2 is obtained.
{"title":"The nuclear hyperfine specific heat of a holmium single crystal from 0.6 to 5 K","authors":"S. J. Collocott","doi":"10.1088/0305-4608/18/10/001","DOIUrl":"https://doi.org/10.1088/0305-4608/18/10/001","url":null,"abstract":"The specific heat of a holmium single crystal has been measured in the range 0.6 to 5 K, and is compared with previously reported measurements made on polycrystalline material. For the holmium single crystal, a value of the electric specific heat coefficient, gamma , of 2.1+or-1 mJ mol-1K2 is obtained.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79936155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-10-01DOI: 10.1088/0305-4608/18/10/014
S. Hirooka, M. Shimizu
The authors present a method which takes account of the quantum effect of spin fluctuations on itinerant electron ferromagnets in the functional integral formalism and in the gaussian approximation. Using a similar approximation to that introduced by Hertz and Klenin (1977) and the results obtained in the authors' previous work they obtain the dynamical spin susceptibility. Dynamics of spin fluctuations are taken into account through the amplitudes of the local spin fluctuations which are the most fundamental parameters dominating the thermodynamical and magnetic properties of the system. It is shown by simple numerical examples that a remarkable improvement is established for the temperature dependence of the spontaneous magnetisation and the paramagnetic susceptibility as compared with the results obtained in the so-called static approximation.
{"title":"Dynamical effect of spin fluctuations in itinerant electron magnetism","authors":"S. Hirooka, M. Shimizu","doi":"10.1088/0305-4608/18/10/014","DOIUrl":"https://doi.org/10.1088/0305-4608/18/10/014","url":null,"abstract":"The authors present a method which takes account of the quantum effect of spin fluctuations on itinerant electron ferromagnets in the functional integral formalism and in the gaussian approximation. Using a similar approximation to that introduced by Hertz and Klenin (1977) and the results obtained in the authors' previous work they obtain the dynamical spin susceptibility. Dynamics of spin fluctuations are taken into account through the amplitudes of the local spin fluctuations which are the most fundamental parameters dominating the thermodynamical and magnetic properties of the system. It is shown by simple numerical examples that a remarkable improvement is established for the temperature dependence of the spontaneous magnetisation and the paramagnetic susceptibility as compared with the results obtained in the so-called static approximation.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"106 1","pages":"2237-2251"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87945380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-09-01DOI: 10.1088/0305-4608/18/9/003
I. Nowik, I. Felner, Y. Wolfus, Y. Yeshurun
Mossbauer spectra of amorphous Fe83B12Si5 ribbons at temperatures 90 to 800 K and their isothermal time evolution have been recorded. The analysis of the experimental spectra reveals that crystallisation begins at about 600 K and crystalline Fe2B, Fe metal and FeSi are formed either isothermally in time or by raising the temperature above 700 K.
{"title":"A Mössbauer study of the crystallisation process of magnetic metallic glass Fe83B12Si5","authors":"I. Nowik, I. Felner, Y. Wolfus, Y. Yeshurun","doi":"10.1088/0305-4608/18/9/003","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/003","url":null,"abstract":"Mossbauer spectra of amorphous Fe83B12Si5 ribbons at temperatures 90 to 800 K and their isothermal time evolution have been recorded. The analysis of the experimental spectra reveals that crystallisation begins at about 600 K and crystalline Fe2B, Fe metal and FeSi are formed either isothermally in time or by raising the temperature above 700 K.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"197 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75898665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-09-01DOI: 10.1088/0305-4608/18/9/002
S. Matsuo, T. Ishimasa, H. Nakano, Y. Fukano
The field and temperature dependence of the magnetisation is studied in a stable Al-Cu-Fe icosahedral phase, in the temperature region between 77 and 1050 K and in magnetic fields up to 18 kOe. The sample shows a good quality of structural perfection in X-ray diffraction and electron microscope observations as compared with known icosahedral phases. The magnetic susceptibility shows an increase from -1.5*10-7 to 4.5*10-7 EMU g-1 with a rise in temperature from 150 to 1050 K, which has not been observed icosahedral phases studied to date.
{"title":"High-temperature magnetic properties of a stable Al65Cu20Fe15 icosahedral phase","authors":"S. Matsuo, T. Ishimasa, H. Nakano, Y. Fukano","doi":"10.1088/0305-4608/18/9/002","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/002","url":null,"abstract":"The field and temperature dependence of the magnetisation is studied in a stable Al-Cu-Fe icosahedral phase, in the temperature region between 77 and 1050 K and in magnetic fields up to 18 kOe. The sample shows a good quality of structural perfection in X-ray diffraction and electron microscope observations as compared with known icosahedral phases. The magnetic susceptibility shows an increase from -1.5*10-7 to 4.5*10-7 EMU g-1 with a rise in temperature from 150 to 1050 K, which has not been observed icosahedral phases studied to date.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75118068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-09-01DOI: 10.1088/0305-4608/18/9/024
K. Taylor, R. Vaile, D. Matthews, A. Bailey, G. Russell, J. Cochrane, B. Hunter
A series of compositions in the region of the YBa2Cu3O7- delta superconducting phase have been studied exhaustively. These materials show significant changes in the X-ray diffraction line intensities which are closely correlated with variations in both the electrical conductivity and the thermoelectric properties as a function of composition. Evidence exists to suggest that these changes may correspond to a change in the hole concentration with increasing x. It is proposed that these effects are associated with the continuous introduction of yttrium planar stacking faults which automatically compensate for the yttrium-barium imbalance and at the same time generate an increased oxygen concentration.
{"title":"A study of the YxBa1-xCuOy superconductors for 0.3","authors":"K. Taylor, R. Vaile, D. Matthews, A. Bailey, G. Russell, J. Cochrane, B. Hunter","doi":"10.1088/0305-4608/18/9/024","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/024","url":null,"abstract":"A series of compositions in the region of the YBa2Cu3O7- delta superconducting phase have been studied exhaustively. These materials show significant changes in the X-ray diffraction line intensities which are closely correlated with variations in both the electrical conductivity and the thermoelectric properties as a function of composition. Evidence exists to suggest that these changes may correspond to a change in the hole concentration with increasing x. It is proposed that these effects are associated with the continuous introduction of yttrium planar stacking faults which automatically compensate for the yttrium-barium imbalance and at the same time generate an increased oxygen concentration.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"46 1","pages":"2069-2079"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76291753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-09-01DOI: 10.1088/0305-4608/18/9/011
F. Merlo
The intermediate phases present in 100 A-B binary systems (A=C, Sr, Ba, Eu, Yb; B=Mg, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi) always show volume contractions as regards the linear Zen-like trend. These volume effects are described by the equation V=xVB0+(1-x)VA0-(n+1)(n+2)xn(1-x) mod chi A- chi B mod , where V is the volume per atom for a given phase, VA0 and VBO are the elemental atomic volumes of the components, x is the atomic percentage of B, n is a parameter related to the composition of the phase with the highest contraction value and chi is a charge transfer atomic parameter. The chi values for the 25 considered elements, determined by an iterative fitting process of the experimental data, correlate with Pauling's electronegativity. The atomic volume of about 440 intermetallic compounds have been calculated with an average variance of 2.5% (0.7 AA3/atom). The present empirical prediction confirms the importance of the charge transfer mechanism on the volume effects observed in the intermetallic compounds of electropositive elements.
100个A- b二元体系中存在中间相(A=C, Sr, Ba, Eu, Yb;B=Mg, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi)总是呈呈线性禅宗趋势的体积收缩。这些体积效应由方程V=xVB0+(1-x)VA0-(n+1)(n+2)xn(1-x) mod chi A- chi B mod描述，其中V是给定相的每个原子的体积，VA0和VBO是组分的元素原子体积，x是B的原子百分比，n是与具有最高收缩值的相组成有关的参数，chi是电荷转移原子参数。25个考虑元素的chi值，由实验数据的迭代拟合过程确定，与鲍林的电负性相关。计算了约440种金属间化合物的原子体积，平均方差为2.5% (0.7 AA3/原子)。目前的经验预测证实了电荷转移机制对电正性元素金属间化合物中所观察到的体积效应的重要性。
{"title":"Volume effects in the intermetallic compounds formed by Ca, Sr, Ba, Eu, and Yb with other elements","authors":"F. Merlo","doi":"10.1088/0305-4608/18/9/011","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/011","url":null,"abstract":"The intermediate phases present in 100 A-B binary systems (A=C, Sr, Ba, Eu, Yb; B=Mg, Pd, Pt, Cu, Ag, Au, Zn, Cd, Hg, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi) always show volume contractions as regards the linear Zen-like trend. These volume effects are described by the equation V=xVB0+(1-x)VA0-(n+1)(n+2)xn(1-x) mod chi A- chi B mod , where V is the volume per atom for a given phase, VA0 and VBO are the elemental atomic volumes of the components, x is the atomic percentage of B, n is a parameter related to the composition of the phase with the highest contraction value and chi is a charge transfer atomic parameter. The chi values for the 25 considered elements, determined by an iterative fitting process of the experimental data, correlate with Pauling's electronegativity. The atomic volume of about 440 intermetallic compounds have been calculated with an average variance of 2.5% (0.7 AA3/atom). The present empirical prediction confirms the importance of the charge transfer mechanism on the volume effects observed in the intermetallic compounds of electropositive elements.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"1 1","pages":"1905-1911"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89978532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1988-09-01DOI: 10.1088/0305-4608/18/9/022
T. Kaneko, T. Sasaki, M. Sakuda, R. Yamamoto, T. Nakamura, H. Yamamoto, S. Tanaka
The authors have synthesised molybdenum/copper multilayered films by the alternate deposition of molybdenum and copper metals in an ultra-high vacuum (10-7 Pa). Sapphire (11.0) and Si(100) were used as the substrates and the substrate temperatures were 40, 80 and 200 degrees C. The films have been characterised by X-ray diffraction. It is revealed that the films had a textured structure with Mo(110)/Cu(111) stacking and that the average grain size perpendicular to the film was largest when the authors used the sapphire (11.0) substrate at 40 degrees C. They also measured the in-plane electrical resistivities of the films. The in-plane resistivity increased with inverse multilayer period, but not monotonically. The authors analysed these results by considering the scattering of electrons from the interfaces of the layers and the modifications of bulk relaxation times by the presence of the grain boundaries within layers.
{"title":"Structures and electrical properties of Cu/Mo metallic multilayered films","authors":"T. Kaneko, T. Sasaki, M. Sakuda, R. Yamamoto, T. Nakamura, H. Yamamoto, S. Tanaka","doi":"10.1088/0305-4608/18/9/022","DOIUrl":"https://doi.org/10.1088/0305-4608/18/9/022","url":null,"abstract":"The authors have synthesised molybdenum/copper multilayered films by the alternate deposition of molybdenum and copper metals in an ultra-high vacuum (10-7 Pa). Sapphire (11.0) and Si(100) were used as the substrates and the substrate temperatures were 40, 80 and 200 degrees C. The films have been characterised by X-ray diffraction. It is revealed that the films had a textured structure with Mo(110)/Cu(111) stacking and that the average grain size perpendicular to the film was largest when the authors used the sapphire (11.0) substrate at 40 degrees C. They also measured the in-plane electrical resistivities of the films. The in-plane resistivity increased with inverse multilayer period, but not monotonically. The authors analysed these results by considering the scattering of electrons from the interfaces of the layers and the modifications of bulk relaxation times by the presence of the grain boundaries within layers.","PeriodicalId":16828,"journal":{"name":"Journal of Physics F: Metal Physics","volume":"5 1","pages":"2053-2060"},"PeriodicalIF":0.0,"publicationDate":"1988-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81254957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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