The Open Superconductors Journal最新文献

Theory of Thermally Activated Vortex Bundles Flow Over the Directional- Dependent Potential Barriers in Type-II Superconductors~!2009-07-21~!2009-10-29~!2010-06-02~! ii型超导体中热激活涡旋束在方向相关势垒上的流动理论

The Open Superconductors Journal Pub Date : 2010-07-06 DOI: 10.2174/1876537801002010012

Wei Yeu Chen

引用次数: 0

Magnetic Properties of the Superconductor LaCaBaCu3O7 超导体LaCaBaCu3O7的磁性能

The Open Superconductors Journal Pub Date : 2010-07-06 DOI: 10.2174/1876537801002010019

D. Bustamante, L. Feijoo, A. Osorio, T. Mitrelias, Y. Majima

{"title":"Magnetic Properties of the Superconductor LaCaBaCu3O7","authors":"D. Bustamante, L. Feijoo, A. Osorio, T. Mitrelias, Y. Majima","doi":"10.2174/1876537801002010019","DOIUrl":"https://doi.org/10.2174/1876537801002010019","url":null,"abstract":"LaCaBaCu 3 O 7 (La1113) is a superconductor below T C(onset) =80K and its structure is similar to the tetragonal YBCO. In this work the magnetic properties of a bulk La1113 sample are reported and compared to those of YBCO superconductor. We explore a possibly relation of this property to its particular crystalline structure, particularly to the oxygen deficiency. In contrast to a bulk YBCO, some magnetic characteristics of La1113 below T C are: the magnetic flux can penetrate easily the bulk in its vortex region (H C1 <H<H C2 ), fewer fields can be trapped than in YBCO, small currents are able to flow in the bulk and possible applications of La1113 are restricted under applied fields lower than 10KOe and in the range of 41K-76K. The critical current density is determined by currents flowing through grain boundaries. Peak effect is observed and it is probably caused by secondary phases or from clusters of oxygen vacancies acting as field induced pins. A first magnetic phase diagram for La1113 showing the irreversibility line is reported here. Finally, we found that the specific heat capacity of La1113 is 37.2mJ/K 2 mol. © 2010. All rights reserved","PeriodicalId":262552,"journal":{"name":"The Open Superconductors Journal","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125602487","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}

引用次数: 24

Perspectives of Overdamped Josephson Junctions in Voltage Standard Applications 过阻尼约瑟夫森结在电压标准应用中的展望

The Open Superconductors Journal Pub Date : 2010-02-01 DOI: 10.2174/1876537801002010001

V. Lacquaniti, N. Leo, M. Fretto, A. Sosso

引用次数: 1

Magnetic-Properties of RSr2NbCu2O8; R = Nd, and Tb Compounds Prepared under Extreme Conditions RSr2NbCu2O8的磁性能研究在极端条件下制备的R = Nd和Tb化合物

The Open Superconductors Journal Pub Date : 2009-12-17 DOI: 10.2174/1876537800901010025

S. Balamurugan

引用次数: 0

Synthesis, Electric Transport, Mössbauer Spectroscopy, Specific Heat and Induction of Superconductivity in ReFeAsO (Re=La, Pr, Gd and Sm) † ReFeAsO (Re=La, Pr, Gd和Sm)†的合成，电输运，Mössbauer光谱，比热和超导感应

The Open Superconductors Journal Pub Date : 2009-08-11 DOI: 10.2174/1876537800901010014

R. S. Meena, A. Vajpayee, A. Pal, Monika Mudgel, I. Nowik, I. Felner, H. Kishan, V. Awana

{"title":"Synthesis, Electric Transport, Mössbauer Spectroscopy, Specific Heat and Induction of Superconductivity in ReFeAsO (Re=La, Pr, Gd and Sm) †","authors":"R. S. Meena, A. Vajpayee, A. Pal, Monika Mudgel, I. Nowik, I. Felner, H. Kishan, V. Awana","doi":"10.2174/1876537800901010014","DOIUrl":"https://doi.org/10.2174/1876537800901010014","url":null,"abstract":"We report an easy and versatile route of synthesis for ReFeAsO (Re = La, Gd, Pr and Sm) by both single step and precursor based double step solid-state reaction routes. The studied ground state compounds of the new FeAs based superconductor family crystallize in tetragonal P4/nmm structure, with lattice parameters variation following their ionic radii. The resistivity measurements exhibit clearly the appearance of a metallic step below say 150-130 K, which is reminiscent of the SDW (Spin Density Wave) magnetic character. Also, It is observed that oxygen stoichiometric ReFeAsO is not formed and rather the same is slightly oxygen deficient. The Mossbauer spectroscopy (MS) carried out on some of them at 290 K and 90 K i.e. both above and below the SDW temperature exhibits the Fe ordered state at 90 K. Further the MS is proved to be the most efficient technique in picking up the FeAs based impurities in these materials. The heat capacity measurements on SmFeAsO, clearly demonstrates the SDW temperature with a hump in Cp(T) at around 130 K. Further Sm spins are ordered anti-ferro-magnetically (AFM) at 4.5 K. Superconductivity is also induced in SmFeAsO with Co substitution at Fe site with Tc = 14 K. The general behavior of the ReFeAsO is discussed and it is concluded that (a) they can be synthesized by an easy and versatile methods, (b) their ground state is not oxygen stoichiometric, but deficient and (c) MS is the most efficient technique to pick up the Fe based impurities in these materials, that is yet rampant in this new class of superconductors.","PeriodicalId":262552,"journal":{"name":"The Open Superconductors Journal","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126843378","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}

引用次数: 0

Precursor Size Effects on Kinetics Parameters of Bi-2223 Growth 前驱体尺寸对Bi-2223生长动力学参数的影响

The Open Superconductors Journal Pub Date : 2009-07-01 DOI: 10.2174/1876537800901010008

W. Chen, M. Yavuz, S. Kambe

{"title":"Precursor Size Effects on Kinetics Parameters of Bi-2223 Growth","authors":"W. Chen, M. Yavuz, S. Kambe","doi":"10.2174/1876537800901010008","DOIUrl":"https://doi.org/10.2174/1876537800901010008","url":null,"abstract":"The Bi-2223 phase growth was studied on the view growth Kinetics and described by using suggested kinetic equations, and the kinetics parameters of the 2223 growth were experimentally determined. The precursor particle size effect on Bi-2223 phase growth was studied, as well. Precursors in this experiment were made by four different techniques with different particle sizes, and samples were sintered at same temperature for different sintering time. For the four different precursors, the amount of 2223 phase in the reactant was determined by analysis of X-ray diffraction. Experimental results were analyzed in the view of 2223 phase growth kinetics. Particle size dependence of the mean lifetime of 2212 and 2223 phases were studied. And the effects of special area of precursor particle on 2223 crystal growth were also analyzed. The velocity of the 2223 phase growth was investigated, which was found to be dependent on both the precursor particles' diameter and its total surface area. The velocity of the 2223 phase decomposition was determined, as well. The optimum sintering time tmax and maximum amount of 2223 phase were calculated, and they were found to be dependent on the mean lifetime of 2212 and 2223 phases. When the particle size decreases, the optimum sintering time decreases, and the maximum amount of 2223 phase increases.","PeriodicalId":262552,"journal":{"name":"The Open Superconductors Journal","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121186135","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}

引用次数: 0

An XPS Study on Hg-Doping Effect on Electronic Structure ofBaPb0.75Bi0.25O3 Superconductor hg掺杂对bapb0.75 bi0.25 o3超导体电子结构影响的XPS研究

The Open Superconductors Journal Pub Date : 2009-02-27 DOI: 10.2174/1876537800901010001

Y. Zhang, C. H. Cheng, Y. L. Chen, Y. Cui, H. Lin, Y. Zhao

引用次数: 2