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arXiv - PHYS - Superconductivity Pub Date : 2024-08-07 DOI: arxiv-2408.03857

Guo-Zhu Liu, Zhao-Kun Yang, Xiao-Yin Pan, Jing-Rong Wang, Xin Li, Hao-Fu Zhu, Jie Huang

引用次数: 0

Enhanced Cooper Pairing via Random Matrix Phonons in Superconducting Grains 通过超导晶粒中的随机矩阵声子增强库珀配对

arXiv - PHYS - Superconductivity Pub Date : 2024-08-07 DOI: arxiv-2408.03927

Andrey Grankin, Mohammad Hafezi, Victor Galitski

{"title":"Enhanced Cooper Pairing via Random Matrix Phonons in Superconducting Grains","authors":"Andrey Grankin, Mohammad Hafezi, Victor Galitski","doi":"arxiv-2408.03927","DOIUrl":"https://doi.org/arxiv-2408.03927","url":null,"abstract":"There is rich experimental evidence that granular superconductors and\u0000superconducting films often exhibit a higher transition temperature, $T_{c}$,\u0000than that in bulk samples of the same material. This paper suggests that this\u0000enhancement hinges on random matrix phonons mediating Cooper pairing more\u0000efficiently than bulk phonons. We develop the Eliashberg theory of\u0000superconductivity in chaotic grains, calculate the random phonon spectrum and\u0000solve the Eliashberg equations numerically. Self-averaging of the effective\u0000electron-phonon coupling constant is noted, which allows us to fit the\u0000numerical data with analytical results based on a generalization of the Berry\u0000conjecture. The key insight is that the phonon density of states, and hence\u0000$T_{c}$, shows an enhancement proportional to the ratio of the perimeter and\u0000area of the grain - the Weyl law. We benchmark our results for aluminum films,\u0000and find an enhancement of $T_{c}$ of about $10%$ for a randomly-generated\u0000shape. A larger enhancement of $T_{c}$ is readily possible by optimizing grain\u0000geometries. We conclude by noticing that mesoscopic shape fluctuations in\u0000realistic granular structures should give rise to a further enhancement of\u0000global $T_{c}$ due to the formation of a percolating Josephson network.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931810","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

Doping evolution of the normal state magnetic excitations in pressurized La3Ni2O7 加压 La3Ni2O7 中正常态磁激发的掺杂演变

arXiv - PHYS - Superconductivity Pub Date : 2024-08-07 DOI: arxiv-2408.03763

Hai-Yang Zhang, Yu-Jie Bai, Fan-Jie Kong, Xiu-Qiang Wu, Yu-Heng Xing, Ning Xu

{"title":"Doping evolution of the normal state magnetic excitations in pressurized La3Ni2O7","authors":"Hai-Yang Zhang, Yu-Jie Bai, Fan-Jie Kong, Xiu-Qiang Wu, Yu-Heng Xing, Ning Xu","doi":"arxiv-2408.03763","DOIUrl":"https://doi.org/arxiv-2408.03763","url":null,"abstract":"The doping evolution behaviors of the normal state magnetic excitations (MEs)\u0000of the nickelate La3Ni2O7 are theoretically studied in this paper. For a\u0000filling of n = 3.0 which corresponds roughly to the material which realizes the\u0000superconductivity of about 80 K under moderately high pressures above 14 GPa,\u0000the MEs exhibit a square-like pattern centered at (0,0) which originates from\u0000the intrapocket particle-hole scatterings. Furthermore, it was found that the\u0000MEs show very strong modulations on the interlayer momentum qz. With the\u0000increasing of qz, the patterns of the MEs change dramatically. In the large qz\u0000regime, they turn to be ruled by the interpocket excitation modes with\u0000significantly larger intensity which may play a vital role in the\u0000superconducting pairing. This hidden feature of the MEs was not revealed by\u0000previous studies. The established features of the MEs are found to be very\u0000robust against doping. They persist in the wide hole- or electron-doping regime\u0000around n = 3.0. However, in the heavily electron-doped regime, a Lifshitz\u0000transition will occur. Consequently, the behaviors of the MEs change\u0000qualitatively across this transition. With the absence of the hole pocket, we\u0000predict that a strong tendency toward the spin-density-wave (SDW) order will\u0000develop due to the perfect nesting between the electron and the hole pockets at\u0000n = 4.0. Thus, we have investigated the normal state behaviors of the MEs and\u0000their doping evolutions which may shed light on the mechanism of\u0000superconductivity in pressurized La3Ni2O7.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931747","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

Constraints on superconducting pairing in altermagnets 改变磁体中超导配对的制约因素

arXiv - PHYS - Superconductivity Pub Date : 2024-08-07 DOI: arxiv-2408.03999

Debmalya Chakraborty, Annica M. Black-Schaffer

{"title":"Constraints on superconducting pairing in altermagnets","authors":"Debmalya Chakraborty, Annica M. Black-Schaffer","doi":"arxiv-2408.03999","DOIUrl":"https://doi.org/arxiv-2408.03999","url":null,"abstract":"Superconductivity in the recently discovered altermagnetic materials hosts\u0000large prospects for both fundamental physics and technological applications. In\u0000this work we show that a characteristic spin-sublattice locking in altermagnets\u0000puts severe constraints on possible superconducting pairing. In particular, we\u0000uncover that the most common form of superconductivity, uniform $s$-wave\u0000spin-singlet pairing is not possible to achieve in altermagnets. Considering an\u0000effective model for a $d_{x^2-y^2}$-wave altermagnet on a square lattice, we\u0000instead find that the most likely forms of spin-singlet pairing have\u0000$d_{x^2-y^2}$- or extended $s$-wave symmetry. We also find that the simplest\u0000form of equal-spin-triplet $p$-wave pairing is not allowed, but it can only\u0000exist as a mixed-spin-triplet $p$-wave state. We verify these constraints on\u0000pairing within an interaction-induced model of altermagnetism, where we also\u0000establish their validity for finite-momentum pairing. Additionally we discuss\u0000the possible pairing symmetries for odd-frequency superconducting pairing. Due\u0000to the generality of our results, they are applicable to both intrinsic\u0000superconductivity and proximity-induced superconductivity in\u0000altermagnet-superconductor hybrid junctions.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931800","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

Chirality in the Kagome Metal CsV$_3$Sb$_5$ 鹿目金属 CsV$_3$Sb$_5$ 中的手性

arXiv - PHYS - Superconductivity Pub Date : 2024-08-07 DOI: arxiv-2408.03750

H. J. Elmers, O. Tkach, Y. Lytvynenko, P. Yogi, M. Schmitt, D. Biswas, J. Liu, S. V. Chernov, M. Hoesch, D. Kutnyakhov, N. Wind, L. Wenthaus, M. Scholz, K. Rossnagel, A. Gloskovskii, C. Schlueter, A. Winkelmann, A. -A. Haghighirad, T. -L. Lee, M. Sing, R. Claessen, M. Le Tacon, J. Demsar, G. Schonhense, O. Fedchenko

{"title":"Chirality in the Kagome Metal CsV$_3$Sb$_5$","authors":"H. J. Elmers, O. Tkach, Y. Lytvynenko, P. Yogi, M. Schmitt, D. Biswas, J. Liu, S. V. Chernov, M. Hoesch, D. Kutnyakhov, N. Wind, L. Wenthaus, M. Scholz, K. Rossnagel, A. Gloskovskii, C. Schlueter, A. Winkelmann, A. -A. Haghighirad, T. -L. Lee, M. Sing, R. Claessen, M. Le Tacon, J. Demsar, G. Schonhense, O. Fedchenko","doi":"arxiv-2408.03750","DOIUrl":"https://doi.org/arxiv-2408.03750","url":null,"abstract":"Using x-ray photoelectron diffraction (XPD) and angle-resolved photoemission\u0000spectroscopy, we study photoemission intensity changes related to changes in\u0000the geometric and electronic structure in the kagome metal CsV$_3$Sb$_5$ upon\u0000transition to an unconventional charge density wave (CDW) state. The XPD\u0000patterns reveal the presence of a chiral atomic structure in the CDW phase.\u0000Furthermore, using circularly polarized x-rays, we have found a pronounced\u0000non-trivial circular dichroism in the angular distribution of the valence band\u0000photoemission in the CDW phase, indicating a chirality of the electronic\u0000structure. This observation is consistent with the proposed orbital loop\u0000current order. In view of a negligible spontaneous Kerr signal in recent\u0000magneto-optical studies, the results suggest an antiferromagnetic coupling of\u0000the orbital magnetic moments along the $c$-axis. While the inherent structural\u0000chirality may also induce circular dichroism, the observed asymmetry values\u0000seem to be too large in the case of the weak structural distortions caused by\u0000the CDW.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141969758","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

Evidence chain for time-reversal symmetry-breaking kagome superconductivity 打破时间反转对称的可果美超导电性证据链

arXiv - PHYS - Superconductivity Pub Date : 2024-08-06 DOI: arxiv-2408.02898

Hanbin Deng, Guowei Liu, Z. Guguchia, Tianyu Yang, Jinjin Liu, Zhiwei Wang, Yaofeng Xie, Sen Shao, Haiyang Ma, William Liège, Frédéric Bourdarot, Xiao-Yu Yan, Hailang Qin, C. Mielke III, R. Khasanov, H. Luetkens, Xianxin Wu, Guoqing Chang, Jianpeng Liu, Morten Holm Christensen, Andreas Kreisel, Brian Møller Andersen, Wen Huang, Yue Zhao, Philippe Bourges, Yugui Yao, Pengcheng Dai, Jia-Xin Yin

{"title":"Evidence chain for time-reversal symmetry-breaking kagome superconductivity","authors":"Hanbin Deng, Guowei Liu, Z. Guguchia, Tianyu Yang, Jinjin Liu, Zhiwei Wang, Yaofeng Xie, Sen Shao, Haiyang Ma, William Liège, Frédéric Bourdarot, Xiao-Yu Yan, Hailang Qin, C. Mielke III, R. Khasanov, H. Luetkens, Xianxin Wu, Guoqing Chang, Jianpeng Liu, Morten Holm Christensen, Andreas Kreisel, Brian Møller Andersen, Wen Huang, Yue Zhao, Philippe Bourges, Yugui Yao, Pengcheng Dai, Jia-Xin Yin","doi":"arxiv-2408.02898","DOIUrl":"https://doi.org/arxiv-2408.02898","url":null,"abstract":"Superconductivity and magnetism are antagonistic quantum matter, while their\u0000intertwining has long been considered in frustrated-lattice systems1-3. In this\u0000work, we utilize scanning tunneling microscopy and muon spin resonance to\u0000discover time-reversal symmetry-breaking superconductivity in kagome metal\u0000Cs(V,Ta)3Sb5, where the Cooper pairing exhibits magnetism and is modulated by\u0000it. In the magnetic channel, we observe spontaneous internal magnetism in a\u0000full-gap superconducting state. Under perturbations of inverse magnetic fields,\u0000we detect a time-reversal asymmetrical interference of Bogoliubov\u0000quasi-particles at a circular vector. At this vector, the pairing gap\u0000spontaneously modulates, which is distinct from pair density waves occurring at\u0000a point vector and consistent with the theoretical proposal of unusual\u0000interference effect under time-reversal symmetry-breaking. The correlation\u0000between internal magnetism, Bogoliubov quasi-particles, and pairing modulation\u0000provides a chain of experimental clues for time-reversal symmetry-breaking\u0000kagome superconductivity.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931812","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

Chiral kagome superconductivity modulations with residual Fermi arcs in KV3Sb5 and CsV3Sb5 KV3Sb5 和 CsV3Sb5 中具有残余费米弧的手性卡戈米超导调制

arXiv - PHYS - Superconductivity Pub Date : 2024-08-06 DOI: arxiv-2408.02896

Hanbin Deng, Hailang Qin, Guowei Liu, Tianyu Yang, Ruiqing Fu, Zhongyi Zhang, Xianxin Wu, Zhiwei Wang, Youguo Shi, Jinjin Liu, Hongxiong Liu, Xiao-Yu Yan, Wei Song, Xitong Xu, Yuanyuan Zhao, Mingsheng Yi, Gang Xu, Hendrik Hohmann, Sofie Castro Holbæk, Matteo Dürrnage, Sen Zhou, Guoqing Chang, Yugui Yao, Qianghua Wang, Zurab Guguchia, Titus Neupert, Ronny Thomale, Mark H. Fischer, Jia-Xin Yin

{"title":"Chiral kagome superconductivity modulations with residual Fermi arcs in KV3Sb5 and CsV3Sb5","authors":"Hanbin Deng, Hailang Qin, Guowei Liu, Tianyu Yang, Ruiqing Fu, Zhongyi Zhang, Xianxin Wu, Zhiwei Wang, Youguo Shi, Jinjin Liu, Hongxiong Liu, Xiao-Yu Yan, Wei Song, Xitong Xu, Yuanyuan Zhao, Mingsheng Yi, Gang Xu, Hendrik Hohmann, Sofie Castro Holbæk, Matteo Dürrnage, Sen Zhou, Guoqing Chang, Yugui Yao, Qianghua Wang, Zurab Guguchia, Titus Neupert, Ronny Thomale, Mark H. Fischer, Jia-Xin Yin","doi":"arxiv-2408.02896","DOIUrl":"https://doi.org/arxiv-2408.02896","url":null,"abstract":"Superconductivity involving finite momentum pairing can lead to spatial gap\u0000and pair density modulations, as well as Bogoliubov Fermi states within the\u0000superconducting gap. However, the experimental realization of their intertwined\u0000relations has been challenging. Here, we detect chiral kagome superconductivity\u0000modulations with residual Fermi arcs in KV3Sb5 and CsV3Sb5 by normal and\u0000Josephson scanning tunneling microscopy down to 30mK with resolved electronic\u0000energy difference at microelectronvolt level. We observe a U-shaped\u0000superconducting gap with flat residual in-gap states. This gap exhibits chiral\u00002 by 2 spatial modulations with magnetic field tunable chirality, which align\u0000with the chiral 2 by 2 pair density modulations observed through Josephson\u0000tunneling. These findings demonstrate a chiral pair density wave (PDW) that\u0000breaks time-reversal symmetry. Quasiparticle interference imaging of the in-gap\u0000zero-energy states reveals segmented arcs, with high-temperature data linking\u0000them to parts of the reconstructed V d-orbital states within the charge order.\u0000The detected residual Fermi arcs can be explained by the partial suppression of\u0000these d-orbital states through an interorbital 2 by 2 PDW and thus serve as\u0000candidate Bogoliubov Fermi states. Additionally, we differentiate the observed\u0000PDW order from impurity-induced gap modulations. Our observations not only\u0000uncover a chiral PDW order with orbital-selectivity, but also illuminate the\u0000fundamental space-momentum correspondence inherent in finite momentum paired\u0000superconductivity.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931749","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

Superconducting gap modulations: are they from pair density waves or pair-breaking scattering? 超导间隙调制：它们来自对密度波还是对破散射？

arXiv - PHYS - Superconductivity Pub Date : 2024-08-06 DOI: arxiv-2408.02890

Jia-Xin Yin, Qianghua Wang

引用次数: 0

Strong enhancement of superconductivity via engineered dielectric environment 通过工程介电环境强力增强超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-08-06 DOI: arxiv-2408.03288

Krzysztof Kempa, Michael J. Naughton

引用次数: 0

Superconductivity of bipolarons from quadratic electron-phonon interaction 二次电子-声子相互作用产生的双极子超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-08-06 DOI: arxiv-2408.03266

Zhongjin Zhang, Anatoly Kuklov, Nikolay Prokof'ev, Boris Svistunov

{"title":"Superconductivity of bipolarons from quadratic electron-phonon interaction","authors":"Zhongjin Zhang, Anatoly Kuklov, Nikolay Prokof'ev, Boris Svistunov","doi":"arxiv-2408.03266","DOIUrl":"https://doi.org/arxiv-2408.03266","url":null,"abstract":"In systems with linear electron-phonon interaction (EPI), bound states of\u0000polarons, or bipolarons, form by gaining energy from the lattice deformation.\u0000The quadratic EPI case is fundamentally different: bipolarons form because\u0000electrons lose less energy when the total charge density is \"compacted\". As the\u0000coupling constant is increased, the bipolarons first appear as extended (but\u0000finite radius) soliton-type states. They subsequently decrease in radius until\u0000their size reaches the inter-atomic scale. We present the first numerically\u0000exact solution of the bipolaron problem from quadratic EPI in the presence of\u0000both on-site Hubbard and long-range Coulomb repulsion, and compute estimates of\u0000the largest superconducting transition temperature within the bipolaron\u0000mechanism. We find that $T_c/Omega$ ratios, where $Omega$ is the optical\u0000phonon frequency, can be several times larger than what one may expect from the\u0000linear EPI provided the phonon frequency is increased by orders of magnitude on\u0000occupied sites. Electron-electron repulsion can be tolerated at the expense of\u0000stronger EPI and the most detrimental effect comes from the Coulomb potential\u0000because it easily eliminates extended soliton states.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931750","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