arXiv: Superconductivity最新文献_第10页

Critical current for an insulating regime of an underdamped current-biased topological Josephson junction 欠阻尼偏置电流拓扑约瑟夫森结绝缘状态的临界电流

arXiv: Superconductivity Pub Date : 2020-06-30 DOI: 10.1103/physrevresearch.2.033448

A. Svetogorov, D. Loss, J. Klinovaja

引用次数: 3

Robust superconductivity intertwined with charge density wave and disorder in Pd-intercalated ErTe3 pd嵌入ErTe3中电荷密度波和无序交织的鲁棒超导性

arXiv: Superconductivity Pub Date : 2020-06-25 DOI: 10.1103/PHYSREVRESEARCH.2.043221

A. Fang, Anisha G. Singh, J. Straquadine, I. Fisher, S. Kivelson, A. Kapitulnik

引用次数: 6

Dynamical vortex phase diagram of two-dimensional superconductivity in gated MoS2 门控二硫化钼二维超导的动态涡相图

arXiv: Superconductivity Pub Date : 2020-06-18 DOI: 10.1103/PhysRevMaterials.4.074003

Yu Saito, Yuki M. Itahashi, T. Nojima, Y. Iwasa

引用次数: 10

Anisotropic physical properties and large critical current density in KCa2Fe4As4F2 single crystal KCa2Fe4As4F2单晶的各向异性物理特性和大临界电流密度

arXiv: Superconductivity Pub Date : 2020-06-08 DOI: 10.1103/physrevmaterials.4.104801

S. Pyon, Yuto Kobayashi, A. Takahashi, Wenjie Li, Teng Wang, G. Mu, A. Ichinose, T. Kambara, A. Yoshida, T. Tamegai

{"title":"Anisotropic physical properties and large critical current density in \u0000KCa2Fe4As4F2\u0000 single crystal","authors":"S. Pyon, Yuto Kobayashi, A. Takahashi, Wenjie Li, Teng Wang, G. Mu, A. Ichinose, T. Kambara, A. Yoshida, T. Tamegai","doi":"10.1103/physrevmaterials.4.104801","DOIUrl":"https://doi.org/10.1103/physrevmaterials.4.104801","url":null,"abstract":"We present a systematic study of electrical resistivity, Hall coefficient, magneto-optical imaging, magnetization, and STEM analyses of KCa${_2}$Fe${_4}$As${_4}$F${_2}$ single crystals. Sharp diamagnetic transition and magneto-optical imaging reveal homogeneity of single crystal and prominent Bean-like penetrations of vortices. Large anisotropy of electrical resistivity, with ${rho _c / rho _{ab}}$ > 100, and semiconductor-like ${rho _c}$ suggest that the electronic state is quasi two-dimensional. Hall effect measurements indicate that KCa${_2}$Fe${_4}$As${_4}$F${_2}$ is a multiband system with holes as main carriers. Magnetization measurements reveal significantly larger J$_c$ compared with that in other iron-based superconductors with different values of J$_c$ depending on the direction of magnetic field. Origin of these J$_c$ characteristics is discussed based on microstructural observations using STEM. In addition, further enhancement of J$_c$ in KCa${_2}$Fe${_4}$As${_4}$F${_2}$ for future application is demonstrated in terms of heavy-ion irradiation.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81108118","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

Anomalous thermodynamic properties of quantum critical superconductors 量子临界超导体的反常热力学性质

arXiv: Superconductivity Pub Date : 2020-06-05 DOI: 10.1103/physrevb.102.184505

M. Khodas, M. Dzero, A. Levchenko

引用次数: 5

Multiple scattering camouflaged as magnetic stripes in single crystals of superconducting (La,Sr)2CuO4 超导(La,Sr)2CuO4单晶中伪装成磁条的多重散射

arXiv: Superconductivity Pub Date : 2020-06-04 DOI: 10.3233/JNR-190144

A. Ţuţueanu, T. Tejsner, M. Lăcătuşu, M. Lăcătuşu, H. W. Hansen, H. W. Hansen, K. L. Eliasen, K. L. Eliasen, M. Böhm, P. Steffens, C. Niedermayer, K. Lefmann

引用次数: 1

Electronic phase diagram of Fe1+yTe1−xSex revealed by magnetotransport measurements 磁输运测量揭示的Fe1+yTe1−xSex的电子相图

arXiv: Superconductivity Pub Date : 2020-05-28 DOI: 10.1142/S0217984920400515

Takao Watanabe, T. Otsuka, Shotaro Hagisawa, Yuta Koshika, S. Adachi, T. Usui, Nae Sasaki, S. Sasaki, S. Yamaguchi, Y. Uezono, Y. Nakanishi, M. Yoshizawa, S. Kimura

{"title":"Electronic phase diagram of Fe1+yTe1−xSex revealed by magnetotransport measurements","authors":"Takao Watanabe, T. Otsuka, Shotaro Hagisawa, Yuta Koshika, S. Adachi, T. Usui, Nae Sasaki, S. Sasaki, S. Yamaguchi, Y. Uezono, Y. Nakanishi, M. Yoshizawa, S. Kimura","doi":"10.1142/S0217984920400515","DOIUrl":"https://doi.org/10.1142/S0217984920400515","url":null,"abstract":"Among the Fe-based superconductors, Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ is unique in that its crystal structure is the simplest and the electron correlation level is the strongest, and thus it is important to investigate the doping($x$)-temperature ($T$) phase diagram of this system. However, inevitably incorporated excess Fe currently prevents the establishment of the true phase diagram. We overcome the aforementioned significant problem via developing a new annealing method termed as \"Te-annealing\" wherein single crystals are annealed under Te vapor. Specifically, we conducted various magnetotransport measurements on Te-annealed superconducting Fe$_{1+y}$Te$_{1-x}$Se$_{x}$. We observed that crossover from the incoherent to the coherent electronic state and opening of the pseudogap occurs at high temperatures ($approx$ 150 K for $x$ = 0.2). This is accompanied by a more substantial pseudogap and the emergence of a phase with a multi-band nature at lower temperatures (below $approx$ 50 K for $x$ = 0.2) before superconductivity sets in. Based on the results, the third type electronic phase diagram in Fe-based high-$T_c$ superconductors is revealed.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72903489","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

Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological compound Nb0.25Bi2Se3 拓扑化合物Nb0.25Bi2Se3主体的时间反转不变性和全间隙非常规超导态

arXiv: Superconductivity Pub Date : 2020-05-23 DOI: 10.1103/physrevb.102.134514

D. Das, Katsura Kobayashi, M. Smylie, C. Mielke, Takeshi Takahashi, K. Willa, Jiaxin Yin, U. Welp, M. Z. Hasan, A. Amato, H. Luetkens, Z. Guguchia

{"title":"Time-reversal invariant and fully gapped unconventional superconducting state in the bulk of the topological compound \u0000Nb0.25Bi2Se3","authors":"D. Das, Katsura Kobayashi, M. Smylie, C. Mielke, Takeshi Takahashi, K. Willa, Jiaxin Yin, U. Welp, M. Z. Hasan, A. Amato, H. Luetkens, Z. Guguchia","doi":"10.1103/physrevb.102.134514","DOIUrl":"https://doi.org/10.1103/physrevb.102.134514","url":null,"abstract":"Recently, the niobium (Nb)-doped topological insulator Bi_2Se_3, in which the finite magnetic moments of the Nb atoms are intercalated in the van der Waals gap between the Bi_2Se_3 layers, has been shown to exhibit both superconductivity with T_c = 3 K and topological surface states. Here we report on muon spin rotation experiments probing the temperature-dependent of effective magnetic penetration depth Lambda_eff(T) in the layered topological superconductor candidate Nb_0.25Bi_2Se_3. The exponential temperature dependence of lambda_(eff)^(-2)(T) at low temperatures suggests a fully gapped superconducting state in the bulk with the superconducting transition temperature T_c = 2.9 K and the gap to T_c ratio 2Delta/k_BT_c = 3.95(19). We also revealed that the ratio T_c/lambda_(eff)^(-2) is comparable to those of unconventional superconductors, which hints at an unconventional pairing mechanism. Furthermore, time reversal symmetry breaking was excluded in the superconducting state with sensitive zero-field muSR experiments. We hope the present results will stimulate theoretical investigations to obtain a microscopic understanding of the relation between superconductivity and the topologically non-trivial electronic structure of Nb_0.25Bi_2Se_3.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85052488","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

Three-dimensional Fermi surface and small effective masses in Mo8Ga41 Mo8Ga41的三维费米面和小有效质量

arXiv: Superconductivity Pub Date : 2020-05-20 DOI: 10.1063/5.0005177

Zhixiang Hu, D. Graf, Yu Liu, C. Petrovic

引用次数: 6

Pressure induced Lifshitz transition in ThFeAsN 压力诱导feasn的Lifshitz转变

arXiv: Superconductivity Pub Date : 2020-05-10 DOI: 10.1103/PHYSREVMATERIALS.4.104802

Smritijit Sen, G. Guo

{"title":"Pressure induced Lifshitz transition in ThFeAsN","authors":"Smritijit Sen, G. Guo","doi":"10.1103/PHYSREVMATERIALS.4.104802","DOIUrl":"https://doi.org/10.1103/PHYSREVMATERIALS.4.104802","url":null,"abstract":"In this paper, we present pressure dependent structural parameters and electronic structure of ThFeAsN superconductor. There are no anomalies in the structural parameters as well as elastic constants with hydrostatic pressure which is consistent with the experiments. We study the electronic structure of this compound at different external pressures in terms of density of states, band structure and Fermi surface. Density of states at the Fermi level, coming from Fe-d orbitals follows the same trend as that of the superconducting transition temperature (T$_c$) as a function of hydrostatic pressure. We also observe a pressure induced orbital selective Lifshitz transition in ThFeAsN compound which is quite different from the Lifshitz transitions observed in the other families of Fe-based superconductors. Fermi surfaces of ThFeAsN specially hole like Fermi surfaces at $Gamma$ point are altered significantly with pressure. This modification of Fermi surface topology with pressure seems to play the major role in the reduction of T$_c$ with pressure in ThFeAsN superconductor. Spin-orbit coupling does not affect the Lifshitz transition but it modifies the energy ordering of bands near $Gamma$ point at higher pressure.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85268338","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