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Novel Superconducting Materials最新文献

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Possible High-Temperature Superconductivity in Hygrogenated Fluorine 氢化氟中可能的高温超导性
Novel Superconducting Materials Pub Date : 2017-03-09 DOI: 10.1515/nsm-2017-0005
D. Papaconstantopoulos
{"title":"Possible High-Temperature Superconductivity in Hygrogenated Fluorine","authors":"D. Papaconstantopoulos","doi":"10.1515/nsm-2017-0005","DOIUrl":"https://doi.org/10.1515/nsm-2017-0005","url":null,"abstract":"Abstract Recent computational studies confirmed by experiment have established the occurrence of superconducting temperatures, Tc, near 200 K when the pressure is close to 200 GPa in the compound H3S. Motivated by these findings we investigate in this work the possibility of discovering high-temperature superconductivity in the material H3F. We performed linearized augmented plane wave(LAPW) calculations followed by the determination of the angular momentum components of the density of states, the scattering phase shifts at the Fermi level and the electron-ion matrix element known as the Hopfield parameter. Our calculated Hopfield parameters are much larger than those found in H3S suggesting that they may lead to large electron-phonon coupling constant and hence a large Tc similar or even larger than that of H3S. However, calculations of elastic constants are inconclusive regarding the stability of this material.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132275329","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: 10
Metal hydrogen sulfide superconducting temperature 金属硫化氢超导温度
Novel Superconducting Materials Pub Date : 2016-12-17 DOI: 10.1515/nsm-2017-0001
Nikolay A. Kudryashov, A. Kutukov, Evgeny A. Mazur
{"title":"Metal hydrogen sulfide superconducting temperature","authors":"Nikolay A. Kudryashov, A. Kutukov, Evgeny A. Mazur","doi":"10.1515/nsm-2017-0001","DOIUrl":"https://doi.org/10.1515/nsm-2017-0001","url":null,"abstract":"Abstract Éliashberg theory is generalized to the electronphonon (EP) systems with the not constant density of electronic states. The phonon contribution to the anomalous electron Green’s function (GF) is considered. The generalized Éliashberg equations with the variable density of electronic states are resolved for the hydrogen sulphide SH3 phase under pressure. The dependence of both the real and the imaginary part of the order parameter on the frequency in the SH3 phase is obtained. The Tc = 177 K value in the hydrogen sulfide SH3 phase at the pressure P = 225 GPa has been defined. The results of the solution of the Eliashberg equations for the Im-3m (170 GPa), Im-3m (200 GPa) and R3m (120 GPa) phases are presented. A peak value Tc = 241 K of the superconducting transition temperature has been predicted.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114053732","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: 2
The response of an individual vortex to local mechanical contact 单个涡旋对局部机械接触的响应
Novel Superconducting Materials Pub Date : 2016-01-26 DOI: 10.1515/nsm-2016-0003
A. Kremen, S. Wissberg, Y. Shperber, B. Kalisky
{"title":"The response of an individual vortex to local mechanical contact","authors":"A. Kremen, S. Wissberg, Y. Shperber, B. Kalisky","doi":"10.1515/nsm-2016-0003","DOIUrl":"https://doi.org/10.1515/nsm-2016-0003","url":null,"abstract":"Abstract Recently we reported a new way to manipulate vortices in thin superconducting films by local mechanical contact without magnetic field, current or altering the pinning landscape [1]. We use scanning superconducting interference device (SQUID) microscopy to image the vortices, and a piezo element to push the tip of a silicon chip into contact with the sample. As a result of the stress applied at the contact point, vortices in the proximity of the contact point change their location. Here we study the characteristics of this vortex manipulation, by following the response of individual vortices to single contact events. Mechanical manipulation of vortices provides local view of the interaction between strain and nanomagnetic objects, as well as controllable, effective, localized, and reproducible manipulation technique.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122064526","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
High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS 超高压下硫化物的高温超导:超越常规BCS的复杂超导相
Novel Superconducting Materials Pub Date : 2016-01-26 DOI: 10.1515/nsm-2016-0004
A. Bussmann-Holder, J. Köhler, M. whangbo, A. Bianconi, A. Simon
{"title":"High temperature superconductivity in sulfur hydride under ultrahigh pressure: A complex superconducting phase beyond conventional BCS","authors":"A. Bussmann-Holder, J. Köhler, M. whangbo, A. Bianconi, A. Simon","doi":"10.1515/nsm-2016-0004","DOIUrl":"https://doi.org/10.1515/nsm-2016-0004","url":null,"abstract":"Abstract The recent report of superconductivity under high pressure at the record transition temperature of Tc =203 K in pressurized H2S has been identified as conventional in view of the observation of an isotope effect upon deuteration. Here it is demonstrated that conventional theories of superconductivity in the sense of BCS or Eliashberg formalisms cannot account for the pressure dependence of the isotope coefficient. The only way out of the dilemma is a multi-band approach of superconductivity where already small interband coupling suffices to achieve the high values of Tc together with the anomalous pressure dependent isotope coefficient. In addition, it is shown that anharmonicity of the hydrogen bonds vanishes under pressure whereas anharmonic phonon modes related to sulfur are still active.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132409987","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: 18
Evolution of superconductivity and magnetism in BiS2-based layered compounds 铋基层状化合物中超导性和磁性的演化
Novel Superconducting Materials Pub Date : 2016-01-18 DOI: 10.1515/nsm-2016-0001
S. Demura
{"title":"Evolution of superconductivity and magnetism in BiS2-based layered compounds","authors":"S. Demura","doi":"10.1515/nsm-2016-0001","DOIUrl":"https://doi.org/10.1515/nsm-2016-0001","url":null,"abstract":"Abstract BiS2-based compounds constitute a new family of layered superconductors. In this article, several experimental findings on the superconductivity and related properties of the BiS2 family are reviewed. In particular, the focus is on the conditions required for the emergence of superconductivity and higher superconducting transition temperature in the BiS2 family: it is shown that optimizing the electron doping and crystal structure are important. Further, a few notable characteristics such as the coexistence of superconductivity and magnetism as well as the relation between the superconductivity and chargedensity- wave instability are introduced in brief.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133964853","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: 3
Effect of spacer layer on flux-pinning properties of iron-based superconductors 间隔层对铁基超导体磁钉钉性能的影响
Novel Superconducting Materials Pub Date : 2016-01-05 DOI: 10.1515/nsm-2016-0005
D. Di Gioacchino, N. Poccia, A. Marcelli, A. Puri, Zhu-An Xu, Jie Cheng, W. Chu, N. Saini
{"title":"Effect of spacer layer on flux-pinning properties of iron-based superconductors","authors":"D. Di Gioacchino, N. Poccia, A. Marcelli, A. Puri, Zhu-An Xu, Jie Cheng, W. Chu, N. Saini","doi":"10.1515/nsm-2016-0005","DOIUrl":"https://doi.org/10.1515/nsm-2016-0005","url":null,"abstract":"Abstract We investigated the magnetic flux-pinning in iron-based 1111-type (REFeAsO, RE= rare earth) and 11- type (FeSe1−xTex) superconductors by third harmonic acmagnetic susceptibility measurements, a technique sensitive to the dynamics of magnetization, probing non-linear processes in flux pinning transport. Despite the larger thermal fluctuations due to the high critical temperature and large anisotropy, flux dynamics of 1111-type pnictides points out a more efficient pinning mechanism than the one in the 11-type chalcogenides. We have associated the stronger pinning in the 1111-family to the presence of REO (RE=rare earth) spacer layers separating the active FeAslayers unlike the 11-chalcogenides in which no spacer layers are present. Therefore, the disorder in the FeAs layers induced by the misfit strain due to spacer layers has an important role in the enhanced flux pinning of 1111-type superconductors.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125765043","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: 1
Nambu-Goldstone-Leggett modes in multi-condensate superconductors 多凝聚超导体中的Nambu-Goldstone-Leggett模式
Novel Superconducting Materials Pub Date : 2015-12-31 DOI: 10.1515/nsm-2015-0010
T. Yanagisawa
{"title":"Nambu-Goldstone-Leggett modes in multi-condensate superconductors","authors":"T. Yanagisawa","doi":"10.1515/nsm-2015-0010","DOIUrl":"https://doi.org/10.1515/nsm-2015-0010","url":null,"abstract":"Abstract Multi-gap superconductors exhibit interesting properties. In an N-gap superconductor, we have in general U(1)N phase invariance. This multiple-phase invariance is partially or totally spontaneously broken in a superconductor. The Nambu-Goldstone modes, as well as Higgs modes, are important and will play an important role in multi-condensate superconductors. The additional phase invariance leads to a new quantum phase, with help of frustrated Josephson effects, such as the time-reversal symmetry breaking, the emergence of massless modes and fractionally quantized-flux vortices. There is a possibility that half-flux vortices exist in two-component superconductors in a magnetic field. The half-quantum flux vortex can be interpreted as a monopole, and two half-flux vortices form a bound state connected by a domain wall. There is an interesting analogy between quarks and fractionally quantized-flux vortices in superconductors.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133960609","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: 5
Effect of Hydrostatic Pressure on BiS2-Based Layered Superconductors: A Review 静水压力对铋基层状超导体的影响研究进展
Novel Superconducting Materials Pub Date : 2015-12-29 DOI: 10.1515/nsm-2016-0002
R. Jha, V. Awana
{"title":"Effect of Hydrostatic Pressure on BiS2-Based Layered Superconductors: A Review","authors":"R. Jha, V. Awana","doi":"10.1515/nsm-2016-0002","DOIUrl":"https://doi.org/10.1515/nsm-2016-0002","url":null,"abstract":"Abstract We report impact of hydrostatic pressure on the newly discovered BiS2 based superconductors. In last couple of years the new BiS2 based superconductor attracted great attention of the condensed matter physics community. These new layered BiS2-based compounds are very sensitive to the concentration of carriers doping and pressure that cause profound changes in their physical properties with appearance of superconductivity in the vicinity of their insulating/semiconducting state. The BiS2-based new compounds are expected to provide us with the next stage of exploring new superconductors and to discuss their exotic superconductivity mechanisms. In current review, we present most of our findings related to impact of hydrostatic pressure on superconductivity of new BiS2 based superconductors at one place.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123564801","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: 4
Chemical Substitution and High Pressure Effects on Superconductivity in the LnOBiS2 (Ln = La-Nd) System 化学取代和高压对LnOBiS2 (Ln = La-Nd)体系超导性的影响
Novel Superconducting Materials Pub Date : 2015-12-14 DOI: 10.1515/nsm-2015-0009
Y. Fang, C. Wolowiec, D. Yazıcı, M. Maple
{"title":"Chemical Substitution and High Pressure Effects on Superconductivity in the LnOBiS2 (Ln = La-Nd) System","authors":"Y. Fang, C. Wolowiec, D. Yazıcı, M. Maple","doi":"10.1515/nsm-2015-0009","DOIUrl":"https://doi.org/10.1515/nsm-2015-0009","url":null,"abstract":"Abstract A large number of compounds which contain BiS2 layers exhibit enhanced superconductivity upon electron doping. Much interest and research effort has been focused on BiS2-based compounds which provide new opportunities for exploring the nature of superconductivity. Important to the study of BiS2-based superconductors is the relation between structure and superconductivity. By modifying either the superconducting BiS2 layers or the blocking layers in these layered compounds, one can effectively tune the lattice parameters, local atomic environment, electronic structure, and other physical properties of these materials. In this article, we will review some of the recent progress on research of the effects of chemical substitution in BiS2-based compounds, with special attention given to the compounds in the LnOBiS2 (Ln = La-Nd) system. Strategieswhich are reported to be essential in optimizing superconductivity of these materials will also be discussed.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121667294","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: 7
Theoretical aspects of the study on the new bismuth chalcogenide based superconductors 新型硫系铋超导体的理论研究
Novel Superconducting Materials Pub Date : 2015-11-30 DOI: 10.1515/nsm-2015-0005
H. Usui, K. Kuroki
{"title":"Theoretical aspects of the study on the new bismuth chalcogenide based superconductors","authors":"H. Usui, K. Kuroki","doi":"10.1515/nsm-2015-0005","DOIUrl":"https://doi.org/10.1515/nsm-2015-0005","url":null,"abstract":"Abstract We review theoretical aspects of the studies on the recently discovered BiCh2 (Ch=chalcogen) based superconductors. We first focus on the electronic band structure, the Fermi surface and their correlation with the lattice structure. We then discuss the phonon features and the issue of the lattice instability. Finally, we survey the phonon-mediated as well as the unconventional pairing mechanisms that have been proposed so far.","PeriodicalId":153480,"journal":{"name":"Novel Superconducting Materials","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132802942","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: 15
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