Amish G. Joshi, M.V. Subbarao, Shah Nikesh A, D.G. Kuberkar, R.G. Kulkarni
{"title":"Mo和Mo- ca取代对GdBa2Cu3O7−δ超导性的影响","authors":"Amish G. Joshi, M.V. Subbarao, Shah Nikesh A, D.G. Kuberkar, R.G. Kulkarni","doi":"10.1016/S0964-1807(98)00121-5","DOIUrl":null,"url":null,"abstract":"<div><p>The structural and superconducting properties of (Gd<sub>1−<em>y</em></sub>Ca<sub><em>y</em></sub>)Ba<sub>2</sub>(Cu<sub>1−<em>x</em></sub>Mo<sub><em>x</em></sub>)<sub>3</sub>O<sub><em>z</em></sub> samples are investigated using X-ray diffraction, A.C. susceptibility, electrical resistivity and oxygen content measurements. The effect of increasing the Mo concentration in GdBa<sub>2</sub>(Cu<sub>1−<em>x</em></sub>Mo<sub><em>x</em></sub>)<sub>3</sub>O<sub><em>z</em></sub> changes the structure from orthorhombic to tetragonal, accompanied by an increase in the normal state resistivity and decreases both the oxygen content and <em>T</em><sub>c</sub>, which is attributed to hole filling by Mo. This suppression in <em>T</em><sub>c</sub> has been compensated for by appropriate hole doping with Ca, for instance in the oxide (Gd<sub>1−<em>y</em></sub>Ca<sub><em>y</em></sub>)Ba<sub>2</sub>(Cu<sub>0.92</sub>Mo<sub>0.08</sub>)<sub>3</sub>O<sub>z</sub>, the <em>T</em><sub>c</sub> increases from 27<!--> <!-->K (<em>y</em>=0.0) to 86.5<!--> <!-->K (<em>y</em>=0.24, compensated oxide), closer to the value of 91<!--> <!-->K for pure GdBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<em>δ</em></sub> due to the balance between the hole filling by Mo and hole doping by Ca.</p></div>","PeriodicalId":100110,"journal":{"name":"Applied Superconductivity","volume":"6 7","pages":"Pages 471-481"},"PeriodicalIF":0.0000,"publicationDate":"1998-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00121-5","citationCount":"3","resultStr":"{\"title\":\"Effect of Mo and Mo-Ca substitution on the superconductivity of GdBa2Cu3O7−δ\",\"authors\":\"Amish G. Joshi, M.V. Subbarao, Shah Nikesh A, D.G. Kuberkar, R.G. Kulkarni\",\"doi\":\"10.1016/S0964-1807(98)00121-5\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The structural and superconducting properties of (Gd<sub>1−<em>y</em></sub>Ca<sub><em>y</em></sub>)Ba<sub>2</sub>(Cu<sub>1−<em>x</em></sub>Mo<sub><em>x</em></sub>)<sub>3</sub>O<sub><em>z</em></sub> samples are investigated using X-ray diffraction, A.C. susceptibility, electrical resistivity and oxygen content measurements. The effect of increasing the Mo concentration in GdBa<sub>2</sub>(Cu<sub>1−<em>x</em></sub>Mo<sub><em>x</em></sub>)<sub>3</sub>O<sub><em>z</em></sub> changes the structure from orthorhombic to tetragonal, accompanied by an increase in the normal state resistivity and decreases both the oxygen content and <em>T</em><sub>c</sub>, which is attributed to hole filling by Mo. This suppression in <em>T</em><sub>c</sub> has been compensated for by appropriate hole doping with Ca, for instance in the oxide (Gd<sub>1−<em>y</em></sub>Ca<sub><em>y</em></sub>)Ba<sub>2</sub>(Cu<sub>0.92</sub>Mo<sub>0.08</sub>)<sub>3</sub>O<sub>z</sub>, the <em>T</em><sub>c</sub> increases from 27<!--> <!-->K (<em>y</em>=0.0) to 86.5<!--> <!-->K (<em>y</em>=0.24, compensated oxide), closer to the value of 91<!--> <!-->K for pure GdBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<em>δ</em></sub> due to the balance between the hole filling by Mo and hole doping by Ca.</p></div>\",\"PeriodicalId\":100110,\"journal\":{\"name\":\"Applied Superconductivity\",\"volume\":\"6 7\",\"pages\":\"Pages 471-481\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1998-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S0964-1807(98)00121-5\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Superconductivity\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0964180798001215\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Superconductivity","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0964180798001215","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
摘要
采用x射线衍射、交流磁化率、电阻率和氧含量测定等方法研究了(Gd1−yCay)Ba2(Cu1−xMox)3Oz样品的结构和超导性能。在GdBa2(Cu1−xMox)3Oz中，Mo浓度的增加使结构由正交向四边形转变，同时伴随着Mo的空穴填充，使氧含量和Tc含量降低。这种抑制作用可以通过适当的空穴掺杂Ca来补偿，例如在氧化物(Gd1−yCay)Ba2(Cu0.92Mo0.08)3Oz中，Tc从27 K (y=0.0)增加到86.5 K (y=0.24，补偿氧化物)。纯GdBa2Cu3O7−δ接近91 K，这是由于Mo填充空穴和Ca掺杂空穴之间的平衡。
Effect of Mo and Mo-Ca substitution on the superconductivity of GdBa2Cu3O7−δ
The structural and superconducting properties of (Gd1−yCay)Ba2(Cu1−xMox)3Oz samples are investigated using X-ray diffraction, A.C. susceptibility, electrical resistivity and oxygen content measurements. The effect of increasing the Mo concentration in GdBa2(Cu1−xMox)3Oz changes the structure from orthorhombic to tetragonal, accompanied by an increase in the normal state resistivity and decreases both the oxygen content and Tc, which is attributed to hole filling by Mo. This suppression in Tc has been compensated for by appropriate hole doping with Ca, for instance in the oxide (Gd1−yCay)Ba2(Cu0.92Mo0.08)3Oz, the Tc increases from 27 K (y=0.0) to 86.5 K (y=0.24, compensated oxide), closer to the value of 91 K for pure GdBa2Cu3O7−δ due to the balance between the hole filling by Mo and hole doping by Ca.
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