Dynamic phase transition in disordered Ising model in two dimensions has been studied in presence of external time dependent oscillating magnetic field applying Glauber Monte Carlo techniques. Dynamic phase transitions are identified estimating dynamic order parameter against temperature for different concentrations of disorder. For a given field strength and frequency for which there was no hysteresis, it is observed that disorder is able induce hysteresis in the system. Effect of increasing concentration of disorder on hysteresis loop area has also been studied.
{"title":"Dynamic phase transition in diluted Ising model","authors":"S. Chattopadhyay, Gopal Gorai, S. Santra","doi":"10.1063/1.4917592","DOIUrl":"https://doi.org/10.1063/1.4917592","url":null,"abstract":"Dynamic phase transition in disordered Ising model in two dimensions has been studied in presence of external time dependent oscillating magnetic field applying Glauber Monte Carlo techniques. Dynamic phase transitions are identified estimating dynamic order parameter against temperature for different concentrations of disorder. For a given field strength and frequency for which there was no hysteresis, it is observed that disorder is able induce hysteresis in the system. Effect of increasing concentration of disorder on hysteresis loop area has also been studied.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"37 1","pages":"030017"},"PeriodicalIF":0.0,"publicationDate":"2015-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80946713","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}
S. Majumder, B. Saha, S. Dey, K. Bagani, M. Roy, S. Jana, Satyendra Kumar, Sangam Banerjee
In this manuscript we have successfully synthesized a large scale 3D dendritic α-Fe2O3 hierarchical structure via a hydrothermal reaction. The crystallinity, composition, purity, morphology of the synthesized α-Fe2O3 are characterized by powder X-ray diffraction (PXRD), field emission scanning electron microscopic (FESEM), energy dispersive X-ray spectroscopic (EDS). FESEM image reveals that the individual α-Fe2O3 dendrite consists of a long central trunk with secondary and tertiary branches. For electrochemical H2O2 sensing we have carried out cyclic voltammetry (CV), amperometric i-t measurement. It has been found that the current density vs. H2O2 concentration calibration curve is linear in nature. The present study reveals that the dendritic α-Fe2O3 hierarchical structure exhibits very sensitive electrochemical sensing capability towards H2O2 reduction.
{"title":"3D dendritic α-Fe2O3 nano-architectures: Synthesis and its application on electrochemical non-enzymatic H2O2 sensing","authors":"S. Majumder, B. Saha, S. Dey, K. Bagani, M. Roy, S. Jana, Satyendra Kumar, Sangam Banerjee","doi":"10.1063/1.4917758","DOIUrl":"https://doi.org/10.1063/1.4917758","url":null,"abstract":"In this manuscript we have successfully synthesized a large scale 3D dendritic α-Fe2O3 hierarchical structure via a hydrothermal reaction. The crystallinity, composition, purity, morphology of the synthesized α-Fe2O3 are characterized by powder X-ray diffraction (PXRD), field emission scanning electron microscopic (FESEM), energy dispersive X-ray spectroscopic (EDS). FESEM image reveals that the individual α-Fe2O3 dendrite consists of a long central trunk with secondary and tertiary branches. For electrochemical H2O2 sensing we have carried out cyclic voltammetry (CV), amperometric i-t measurement. It has been found that the current density vs. H2O2 concentration calibration curve is linear in nature. The present study reveals that the dendritic α-Fe2O3 hierarchical structure exhibits very sensitive electrochemical sensing capability towards H2O2 reduction.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"38 1","pages":"050117"},"PeriodicalIF":0.0,"publicationDate":"2015-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75750829","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}
Diamagnetic susceptibility of a randomly distributed donor in a GaAs/Al0.3Ga0.7As Double Quantum Well has been calculated in its ground state as a function of barrier and well width. It is shown that the modification in the barrier and well dimension significantly influences the dimensional character of the donor through modulating the subband distribution and in turn the localization of the donor. The effect of barrier and well thickness on the interparticle distance has also been observed. Interestingly it opens up the possibility of tuning the susceptibility and monitoring the tunnel coupling among the wells.
{"title":"Quantum confinement of a hydrogenic donor in a double quantum well: Through diamagnetic susceptibility","authors":"G. Vignesh, P. Nithiananthi","doi":"10.1063/1.4917685","DOIUrl":"https://doi.org/10.1063/1.4917685","url":null,"abstract":"Diamagnetic susceptibility of a randomly distributed donor in a GaAs/Al0.3Ga0.7As Double Quantum Well has been calculated in its ground state as a function of barrier and well width. It is shown that the modification in the barrier and well dimension significantly influences the dimensional character of the donor through modulating the subband distribution and in turn the localization of the donor. The effect of barrier and well thickness on the interparticle distance has also been observed. Interestingly it opens up the possibility of tuning the susceptibility and monitoring the tunnel coupling among the wells.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"11 1","pages":"050044"},"PeriodicalIF":0.0,"publicationDate":"2015-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84159215","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}
Nano-crystalline Mn0.5Zn0.5Fe2O4 was synthesized by chemical co-precipitation method and characterized with X-ray diffraction. Ac electrical impedance data are taken for the frequency range of 1Hz to 1MHz for various temperatures from 303K to 483K. The ac electrical conduction deviates from the Debye type relaxation which indicates polaron type conduction. In the present study unique anomalous relaxation function in time and frequency domain is used to investigate deviation from the Debye relaxation. The physical basis of anomalous or non-Debye process is explained in terms of change in Debye dipole μD=ρrD of charge ρ into gρ due to the molecular charge interaction and defect disorder. This interaction shifts the Debye relaxation rate τ to a slow relaxation rate τg. The fraction 0
{"title":"Anomalous electrical relaxation and polaron conduction in nano-crystalline Mn0.5Zn0.5Fe2O4","authors":"N. Kumar, T. Shahid, G. Govindaraj","doi":"10.1063/1.4918097","DOIUrl":"https://doi.org/10.1063/1.4918097","url":null,"abstract":"Nano-crystalline Mn0.5Zn0.5Fe2O4 was synthesized by chemical co-precipitation method and characterized with X-ray diffraction. Ac electrical impedance data are taken for the frequency range of 1Hz to 1MHz for various temperatures from 303K to 483K. The ac electrical conduction deviates from the Debye type relaxation which indicates polaron type conduction. In the present study unique anomalous relaxation function in time and frequency domain is used to investigate deviation from the Debye relaxation. The physical basis of anomalous or non-Debye process is explained in terms of change in Debye dipole μD=ρrD of charge ρ into gρ due to the molecular charge interaction and defect disorder. This interaction shifts the Debye relaxation rate τ to a slow relaxation rate τg. The fraction 0<g<1 is emerged as the exponent on frequency and time domain function of non-Debye relaxation.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"32 1","pages":"110041"},"PeriodicalIF":0.0,"publicationDate":"2015-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83176119","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}
Porous carbon sample has been prepared, using zeolite-Y as template followed by annealing at 800°C, with view to estimate the extent of hydrogen storage by the sample. Based on XRD, 13C MAS NMR and Raman spectroscopic studies it is confirmed that the porous Carbon sample contains only sp2 hybridized carbon. The hydrogen sorption isotherms have been recorded for the sample at 273, 223K and 123K and the maximum hydrogen absorption capacity is found to be 1.47wt% at 123K. The interaction energy of hydrogen with the carbon framework was determined to be ∼ 10 kJ mol−1at lower hydrogen uptake and gradually decreases with increase in hydrogen loading.
制备了多孔碳样品，以沸石- y为模板，在800℃下退火，以估计样品的储氢程度。通过XRD、13C MAS NMR和拉曼光谱研究，证实了多孔碳样品中只含有sp2杂化碳。测定了样品在273、223K和123K时的吸氢等温线，发现样品在123K时的最大吸氢量为1.47wt%。在较低的吸氢量下，氢与碳骨架的相互作用能为~ 10 kJ mol−1，并随着氢负荷的增加而逐渐降低。
{"title":"Synthesis, characterization and hydrogen storage studies on porous carbon","authors":"Priyanka Ruz, S. Banerjee, M. Pandey, V. Sudarsan","doi":"10.1063/1.4918256","DOIUrl":"https://doi.org/10.1063/1.4918256","url":null,"abstract":"Porous carbon sample has been prepared, using zeolite-Y as template followed by annealing at 800°C, with view to estimate the extent of hydrogen storage by the sample. Based on XRD, 13C MAS NMR and Raman spectroscopic studies it is confirmed that the porous Carbon sample contains only sp2 hybridized carbon. The hydrogen sorption isotherms have been recorded for the sample at 273, 223K and 123K and the maximum hydrogen absorption capacity is found to be 1.47wt% at 123K. The interaction energy of hydrogen with the carbon framework was determined to be ∼ 10 kJ mol−1at lower hydrogen uptake and gradually decreases with increase in hydrogen loading.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"4 1","pages":"140047"},"PeriodicalIF":0.0,"publicationDate":"2015-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87935009","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 : 2015-01-01DOI: 10.1016/BS.SSP.2015.02.002
R. Rumpf
{"title":"Engineering the Dispersion and Anisotropy of Periodic Electromagnetic Structures","authors":"R. Rumpf","doi":"10.1016/BS.SSP.2015.02.002","DOIUrl":"https://doi.org/10.1016/BS.SSP.2015.02.002","url":null,"abstract":"","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"51 1","pages":"213-300"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80931124","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 : 2015-01-01DOI: 10.1016/BS.SSP.2015.06.001
D. Schmool, H. Kachkachi
{"title":"Single-Particle Phenomena in Magnetic Nanostructures","authors":"D. Schmool, H. Kachkachi","doi":"10.1016/BS.SSP.2015.06.001","DOIUrl":"https://doi.org/10.1016/BS.SSP.2015.06.001","url":null,"abstract":"","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"10 1","pages":"301-423"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80889277","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 : 2015-01-01DOI: 10.1016/BS.SSP.2015.05.001
J. Kishine, A. Ovchinnikov
{"title":"Theory of Monoaxial Chiral Helimagnet","authors":"J. Kishine, A. Ovchinnikov","doi":"10.1016/BS.SSP.2015.05.001","DOIUrl":"https://doi.org/10.1016/BS.SSP.2015.05.001","url":null,"abstract":"","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"27 1","pages":"1-130"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81261307","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}
Structural and electrical transport studies on polycrystalline self-doped Pr1−xMnO3±δ (with x=0, 0.1& 0.125) have been done using XRD and low-temperature resistivity measurement. The results of the Rietveld refinement of XRD data show that all these compounds crystallize in an orthorhombic structure with Pnma space-group. With increasing A-site vacancies, the unit cell volume decrease and lattice parameters undergo non monotonous change. The electrical transport studies reveal insulating behaviour with small polaron hopping above TC and a kink corresponding to canted-antiferromagnetic spin ordering.
{"title":"Structural and electronic transport studies of self-doped Pr1−xMnO3±δ manganites","authors":"A. Shahee, N. Lalla","doi":"10.1063/1.4873014","DOIUrl":"https://doi.org/10.1063/1.4873014","url":null,"abstract":"Structural and electrical transport studies on polycrystalline self-doped Pr1−xMnO3±δ (with x=0, 0.1& 0.125) have been done using XRD and low-temperature resistivity measurement. The results of the Rietveld refinement of XRD data show that all these compounds crystallize in an orthorhombic structure with Pnma space-group. With increasing A-site vacancies, the unit cell volume decrease and lattice parameters undergo non monotonous change. The electrical transport studies reveal insulating behaviour with small polaron hopping above TC and a kink corresponding to canted-antiferromagnetic spin ordering.","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"12 1","pages":"1510-1512"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75208570","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}
Kalpna Jain, S. Kishor, Kh. S. Singh, Ida Josefesson, M. Odelius, L. M. Ramaniah
Dye-sensitized quantum dots (QDs) are considered promising candidates for dye-sensitized solar cells. In order to maximize their efficiency, detailed theoretical studies are important. Here, we report a first principles density functional theory (DFT) investigation of experimentally realized dye - sensitized QD / ligand systems, viz., Cd16S16, capped with acetate molecules and a coumarin dye. The hybrid B3LYP functional and a 6−311+G(d,p)/LANL2dz basis set are used to study the geometric, energetic and electronic properties of these clusters. There is significant structural rearrangement in all the clusters studied - on the surface for the bare QD, and in the positions of the acetate / dye ligands for the ligated QDs. The density of states (DOS) of the bare QD shows states in the band gap, which disappear on surface passivation with the acetate molecules. Interestingly, in the dye-sensitised QD, the HOMO is found to be localized mainly on the dye molecule, while the LUMO is on the QD, as required for phot...
{"title":"First principles DFT study of dye-sensitized CdS quantum dots","authors":"Kalpna Jain, S. Kishor, Kh. S. Singh, Ida Josefesson, M. Odelius, L. M. Ramaniah","doi":"10.1063/1.4872682","DOIUrl":"https://doi.org/10.1063/1.4872682","url":null,"abstract":"Dye-sensitized quantum dots (QDs) are considered promising candidates for dye-sensitized solar cells. In order to maximize their efficiency, detailed theoretical studies are important. Here, we report a first principles density functional theory (DFT) investigation of experimentally realized dye - sensitized QD / ligand systems, viz., Cd16S16, capped with acetate molecules and a coumarin dye. The hybrid B3LYP functional and a 6−311+G(d,p)/LANL2dz basis set are used to study the geometric, energetic and electronic properties of these clusters. There is significant structural rearrangement in all the clusters studied - on the surface for the bare QD, and in the positions of the acetate / dye ligands for the ligated QDs. The density of states (DOS) of the bare QD shows states in the band gap, which disappear on surface passivation with the acetate molecules. Interestingly, in the dye-sensitised QD, the HOMO is found to be localized mainly on the dye molecule, while the LUMO is on the QD, as required for phot...","PeriodicalId":16850,"journal":{"name":"Journal of Physics C: Solid State Physics","volume":"32 1","pages":"583-585"},"PeriodicalIF":0.0,"publicationDate":"2014-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76659883","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：