发布求助
文献互助 智能选刊 最新文献

arXiv: Superconductivity最新文献

筛选
英文 中文
Studies on DC transport and terahertz conductivity of granular molybdenum thin films for microwave radiation detector applications 微波辐射探测器用颗粒钼薄膜的直流输运和太赫兹电导率研究
arXiv: Superconductivity Pub Date : 2020-07-26 DOI: 10.1063/5.0013939
Shilpam Sharma, A. Khandelwal, E. Amaladass, A. S, Ramjan Sk, J. J., A. Mani, M. K. Chattopadhyay
{"title":"Studies on DC transport and terahertz conductivity of granular molybdenum thin films for microwave radiation detector applications","authors":"Shilpam Sharma, A. Khandelwal, E. Amaladass, A. S, Ramjan Sk, J. J., A. Mani, M. K. Chattopadhyay","doi":"10.1063/5.0013939","DOIUrl":"https://doi.org/10.1063/5.0013939","url":null,"abstract":"The morphological, transport and terahertz optical properties of DC magnetron sputtered granular molybdenum thin-films with nano-grains embedded in an amorphous matrix have been studied in the normal and superconducting states. The superconducting transition temperatures of these films are much higher than that of bulk molybdenum. The optical properties of these thin-films have been studied using terahertz time-domain spectroscopy. Their properties have been compared with the existing materials used for the development of radiation detectors. The resistivity of the films lies in >100 micro-Ohm-cm range which is ideal for making highly sensitive radiation detectors. The Hall measurements indicate the presence of holes as the dominant carriers with very small mean free path and mobility. In the normal state, the films are disordered bad metal but they have large superfluid density and stiffness in their superconducting state. The normal state and superconducting properties of the films are very promising for their use in cryogenic radiation detectors for microwave, terahertz, and far IR frequency ranges.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"12 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91433722","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
In-plane electronic anisotropy resulted from ordered magnetic moment in iron-based superconductors 铁基超导体中有序磁矩引起的平面内电子各向异性
arXiv: Superconductivity Pub Date : 2020-07-24 DOI: 10.1103/PHYSREVRESEARCH.2.033140
S.-F. Wu, W.-L. Zhang, V. Thorsmølle, G. Chen, G. Tan, P. Dai, Y. Shi, C. Jin, T. Shibauchi, S. Kasahara, Y. Matsuda, A. Sefat, H. Ding, P. Richard, G. Blumberg
{"title":"In-plane electronic anisotropy resulted from ordered magnetic moment in iron-based superconductors","authors":"S.-F. Wu, W.-L. Zhang, V. Thorsmølle, G. Chen, G. Tan, P. Dai, Y. Shi, C. Jin, T. Shibauchi, S. Kasahara, Y. Matsuda, A. Sefat, H. Ding, P. Richard, G. Blumberg","doi":"10.1103/PHYSREVRESEARCH.2.033140","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.033140","url":null,"abstract":"We used polarization-resolved Raman scattering to study the magneto-elastic coupling in the parent compounds of several families of Fe-based superconductors (BaFe2As2, EuFe2As2, NaFeAs, LiFeAs, FeSe and LaFeAsO). We observe an emergent Ag-symmetry As phonon mode in the XY scattering geometry whose intensity is significantly enhanced below the magneto-structural transition only for compounds showing magnetic ordering. We conclude that the small lattice anisotropy is insufficient to induce the in-plane electronic polarizability anisotropy necessary for the observed phonon intensity enhancement, and interpret this enhancement below the Neel temperature in terms of the anisotropy of the magnetic moment and magneto-elastic coupling. We evidence a Fano line- shape in the XY scattering geometry resulting from a strong coupling between the Ag (As) phonon mode and the B2g symmetry-like electronic continuum. Strong electron-phonon coupling may be relevant to superconductivity.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81281635","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
Effect of external electromagnetic radiation on the anomalous metallic behavior in superconducting Ta thin films 外电磁辐射对超导钽薄膜异常金属行为的影响
arXiv: Superconductivity Pub Date : 2020-07-23 DOI: 10.1103/PHYSREVB.102.184501
Junghyun Shin, Sun-gyu Park, Eunseong Kim
{"title":"Effect of external electromagnetic radiation on the anomalous metallic behavior in superconducting Ta thin films","authors":"Junghyun Shin, Sun-gyu Park, Eunseong Kim","doi":"10.1103/PHYSREVB.102.184501","DOIUrl":"https://doi.org/10.1103/PHYSREVB.102.184501","url":null,"abstract":"We investigated transport characteristics of superconducting Ta thin films with three configurations in rf radiation filters; no filter, only room-temperature filters, and low-temperature filters in addition to room-temperature filters. The transport properties near the transition temperature are strongly dependent on whether the room-temperature filter is installed or not. The entire transition is shifted to higher temperature with loading layers of the room-temperature filters. Once the zero-resistance state is achieved at B=0, no strong radiation effect is observed even with low-temperature filters installed. When magnetic field is turned on, the nonzero-resistance saturation at low temperatures is revealed without low-temperature filters, which has been considered to be magnetic-field-induced quantum metallic phase. However, the insertion of the additional low-temperature filter weakens the saturation of the resistance, the signature of the metallic behavior. This observation suggests that the previously reported anomalous metallic state in Ta films is mainly induced by the unfiltered radiation and, thus, the intrinsic metallic ground state should be limited to the narrow range of magnetic fields near the critical point, if exists.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86478478","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
Thermal fluctuations and vortex lattice structures in chiral p-wave superconductors: Robustness of double-quanta vortices 手性纵波超导体中的热波动和涡旋晶格结构:双量子涡旋的鲁棒性
arXiv: Superconductivity Pub Date : 2020-07-17 DOI: 10.1103/PhysRevB.103.214517
Fredrik Nicolai Krohg, E. Babaev, J. Garaud, H. H. Haugen, A. Sudbø
{"title":"Thermal fluctuations and vortex lattice structures in chiral \u0000p\u0000-wave superconductors: Robustness of double-quanta vortices","authors":"Fredrik Nicolai Krohg, E. Babaev, J. Garaud, H. H. Haugen, A. Sudbø","doi":"10.1103/PhysRevB.103.214517","DOIUrl":"https://doi.org/10.1103/PhysRevB.103.214517","url":null,"abstract":"We use large-scale Monte-Carlo simulations to study thermal fluctuations in chiral $p$-wave superconductors in an applied magnetic field in three dimensions. We consider the thermal stability of previously predicted unusual double-quanta flux-line lattice ground states in such superconductors. In previous works it was shown that, neglecting thermal fluctuations, a chiral $p$-wave superconductor forms a hexagonal lattice of doubly-quantized vortices, except extremely close vicinity of $H_{c2}$ where double-quanta vortices split apart. We find dissociation of double-quanta vortices driven by thermal fluctuations. However, our calculations also show that the previous predictions of hexagonal doubly-quantized vortices, where thermal fluctuations were ignored, are very robust in the considered model.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82214999","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
Visualization by scanning SQUID microscopy of the intermediate state in the superconducting Dirac semimetal PdTe2 用扫描SQUID显微镜观察超导Dirac半金属PdTe2的中间态
arXiv: Superconductivity Pub Date : 2020-07-16 DOI: 10.1103/PHYSREVB.103.104510
P. Garcia-Campos, Y. Huang, A. de Visser, K. Hasselbach
{"title":"Visualization by scanning SQUID microscopy of the intermediate state in the superconducting Dirac semimetal \u0000PdTe2","authors":"P. Garcia-Campos, Y. Huang, A. de Visser, K. Hasselbach","doi":"10.1103/PHYSREVB.103.104510","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.104510","url":null,"abstract":"The Dirac semimetal PdTe${}_2$ becomes superconducting at a temperature $T_{c}=1.6$~K. Thermodynamic and muon spin rotation experiments support type-I superconductivity, which is unusual for a binary compound. A key property of a type-I superconductor is the intermediate state which presents a coexistence of superconducting and normal domains (flux structures) at magnetic fields lower than the thermodynamic critical field $H_{c}$. By means of scanning SQUID microscopy (SSM) we observe flux structures in the superconducting state of PdTe${}_2$. The flux structures are strongly history dependent with a transition from round shapes to laminar shapes as the magnetic field is more and more increased. The field amplitudes measured at the surface are indicative for the presence of Landau branching. The domain wall width in the intermediate state has been determined.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"28 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78865839","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
Underlying mechanism of charge transfer in Li-doped MgH16 at high pressure 高压下掺锂MgH16中电荷转移的潜在机制
arXiv: Superconductivity Pub Date : 2020-07-08 DOI: 10.1103/physrevb.102.184509
Chong Wang, Seho Yi, Shuyuan Liu, Jun-Hyung Cho
{"title":"Underlying mechanism of charge transfer in Li-doped \u0000MgH16\u0000 at high pressure","authors":"Chong Wang, Seho Yi, Shuyuan Liu, Jun-Hyung Cho","doi":"10.1103/physrevb.102.184509","DOIUrl":"https://doi.org/10.1103/physrevb.102.184509","url":null,"abstract":"A lithium-doped magnesium hydride Li$_2$MgH$_{16}$ was recently reported [Y. Sun $et$ $al$., Phys. Rev. Lett. {bf 123}, 097001 (2019)] to exhibit the highest ever predicted superconducting transition temperature $T_{rm c}$ under high pressure. Based on first-principles density-functional theory calculations, we reveal that the Li dopants locating in the pyroclore lattice sites give rise to the excess electrons distributed in interstitial regions. Such loosely bound anionic electrons are easily captured to stabilize a clathrate structure consisting of H cages. This addition of anionic electrons to H cages enhances the H-derived electronic density of states at the Fermi level, thereby leading to a high-$T_{rm c}$ superconductivity. We thus propose that the electride nature of Li dopants is an essential ingredient in the charge transfer between Li dopants and H atoms. Our findings offer a deeper understanding of the underlying mechanism of charge transfer in Li$_2$MgH$_{16}$ at high pressure.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86325206","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
Crystalline anisotropic topological superconductivity in planar Josephson junctions 平面约瑟夫森结的晶体各向异性拓扑超导性
arXiv: Superconductivity Pub Date : 2020-07-07 DOI: 10.1103/PHYSREVRESEARCH.3.013198
Joseph D. Pakizer, B. Scharf, A. Matos-Abiague
{"title":"Crystalline anisotropic topological superconductivity in planar Josephson junctions","authors":"Joseph D. Pakizer, B. Scharf, A. Matos-Abiague","doi":"10.1103/PHYSREVRESEARCH.3.013198","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.3.013198","url":null,"abstract":"We theoretically investigate the crystalline anisotropy of topological phase transitions in phase-controlled planar Josephson junctions (JJs) subject to spin-orbit coupling and in-plane magnetic fields. It is shown how topological superconductivity (TS) is affected by the interplay between the magnetic field and the orientation of the junction with respect to its crystallographic axes. This interplay can be used to electrically tune between BDI and D symmetry classes in a controlled fashion and thereby optimize the stability and localization of Majorana bound states in planar Josephson junctions. Our findings can be used as a guide for achieving the most favorable conditions when engineering TS in planar JJs and can be particularly relevant for setups containing non-collinear junctions which have been proposed for performing braiding operations on multiple Majorana pairs.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90932518","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
Unconventional superconductivity in a strongly correlated band-insulator without doping 非掺杂强相关带绝缘体中的非常规超导性
arXiv: Superconductivity Pub Date : 2020-07-07 DOI: 10.21468/SCIPOSTPHYSCORE.4.2.009
Anwesha Chattopadhyay, H. R. Krishnamurthy, A. Garg
{"title":"Unconventional superconductivity in a strongly correlated band-insulator without doping","authors":"Anwesha Chattopadhyay, H. R. Krishnamurthy, A. Garg","doi":"10.21468/SCIPOSTPHYSCORE.4.2.009","DOIUrl":"https://doi.org/10.21468/SCIPOSTPHYSCORE.4.2.009","url":null,"abstract":"We present a novel route for attaining unconventional superconductivity (SC) in a strongly correlated system without doping. In a simple model of a correlated band insulator (BI) at half-filling we demonstrate, based on a generalization of the projected wavefunctions method, that SC emerges when e-e interactions and the bare band-gap are both much larger than the kinetic energy, provided the system has sufficient frustration against the magnetic order. As the interactions are tuned, SC appears sandwiched between the correlated BI followed by a paramagnetic metal on one side, and a ferrimagnetic metal, antiferromagnetic (AF) half-metal, and AF Mott insulator phases on the other side.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"PP 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84340995","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
Designing nickelate superconductors with d8 configuration exploiting mixed-anion strategy 利用混合阴离子策略设计d8结构的镍酸盐超导体
arXiv: Superconductivity Pub Date : 2020-07-02 DOI: 10.1103/PHYSREVRESEARCH.2.042032
Naoya Kitamine, M. Ochi, K. Kuroki
{"title":"Designing nickelate superconductors with \u0000d8\u0000 configuration exploiting mixed-anion strategy","authors":"Naoya Kitamine, M. Ochi, K. Kuroki","doi":"10.1103/PHYSREVRESEARCH.2.042032","DOIUrl":"https://doi.org/10.1103/PHYSREVRESEARCH.2.042032","url":null,"abstract":"Inspired by a recently proposed superconducting mechanism for a new cuprate superconductor Ba$_2$CuO$_{3+delta}$, we theoretically design an unconventional nickelate superconductor with $d^8$ electron configuration. Our strategy is to enlarge the on-site energy difference between $3d_{x^2-y^2}$ and other $3d$ orbitals by adopting halogens or hydrogen as out-of-plane anions, so that the $3d$ bands other than $d_{x^-y^2}$ lie just below the Fermi level for the $d^8$ configuration, acting as incipient bands that enhance superconductivity. We also discuss a possible relevance of the present proposal to the recently discovered superconductor (Nd,Sr)NiO$_2$.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90036310","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: 9
Amplitudes of minima in dynamic conductance spectra of the SNS Andreev contact SNS Andreev接触动态电导谱的极小值幅值
arXiv: Superconductivity Pub Date : 2020-07-01 DOI: 10.1063/5.0010883
Z. Popović, S. Kuzmichev, T. Kuzmicheva
{"title":"Amplitudes of minima in dynamic conductance spectra of the SNS Andreev contact","authors":"Z. Popović, S. Kuzmichev, T. Kuzmicheva","doi":"10.1063/5.0010883","DOIUrl":"https://doi.org/10.1063/5.0010883","url":null,"abstract":"Despite several theoretical approaches describing multiple Andreev reflections (MAR) effect in superconductor-normal metal-superconductor (SNS) junction are elaborated, the problem of comprehensive and adequate description of MAR is highly actual. In particular, a broadening parameter $Gamma$ is still unaccounted at all, whereas a ballistic condition (the mean free path for inelastic scattering $l$ to the barrier width $d$ ratio) is considered only in the framework of Kummel, Gunsenheimer, and Nikolsky (KGN), as well as Gunsenheimer-Zaikin approaches, for an isotropic case and fully-transparent constriction. Nonetheless, an influence of $l/d$ ratio to the dynamic conductance spectrum ($dI/dV$) features remains disregarded, thus being one of the aims of the current work. Our numerical calculations in the framework of an extended KGN approach develop the $l/d$ variation to determine both the number of the Andreev features and their amplitudes in the $dI/dV$ spectrum. We show, in the spectrum of a diffusive SNS junction ($l/d rightarrow 1$) a suppression of the Andreev excess current, dramatic change in the current voltage $I(V)$-curve slope at low bias, with only the main harmonic at $eV=2Delta$ bias voltage remains well-distinguished in the $dI/dV$-spectrum. Additionally, we attempt to make a first-ever comparison between experimental data for the high-transparency SNS junctions (more than $ 85~%$) and theoretical predictions. As a result, we calculate the temperature dependences of amplitudes and areas of Andreev features within the extended KGN approach, which qualitatively agrees with our experimental data obtained using a \"break-junction\" technique.","PeriodicalId":8514,"journal":{"name":"arXiv: Superconductivity","volume":"61 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87937456","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: 11
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信