arXiv - PHYS - Superconductivity最新文献_第6页

Pairing tendencies in the doped Kitaev-Heisenberg model 掺杂基塔耶夫-海森堡模型中的配对趋势

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04389

Pontus Laurell, Bradraj Pandey, Gábor B. Halász, Satoshi Okamoto, Gonzalo Alvarez, Elbio Dagotto

{"title":"Pairing tendencies in the doped Kitaev-Heisenberg model","authors":"Pontus Laurell, Bradraj Pandey, Gábor B. Halász, Satoshi Okamoto, Gonzalo Alvarez, Elbio Dagotto","doi":"arxiv-2409.04389","DOIUrl":"https://doi.org/arxiv-2409.04389","url":null,"abstract":"We study the impact of hole-doping on the Kitaev-Heisenberg model on the\u0000honeycomb lattice. We investigate the pairing tendencies and correlation\u0000functions in the framework of a $t-J-K$ model using density matrix\u0000renormalization group calculations on three-leg cylinders. In the case of the\u0000pure Kitaev model, which realizes a quantum spin-liquid phase at half-filling,\u0000we find that binding of two holes only occurs at low values of the hopping,\u0000where the holes are slow. We have theoretically verified that pair formation\u0000occurs in the limit of immobile holes, where the pure Kitaev model remains\u0000exactly solvable. When we instead fix the hopping at an intermediate, more\u0000realistic, value, and vary the Heisenberg and Kitaev interaction strengths, we\u0000find pairing tendencies only in the N'eel phase. This is in contrast to prior\u0000mean-field calculations, highlighting the importance of accounting for the\u0000kinetic energy of dopants in generalized Kitaev models. Interestingly, we also\u0000find signatures of pair-density wave formation over the studied range of model\u0000parameters, namely a periodic modulation of the charge density as well as the\u0000spin-spin and pair-pair correlations in real space. Moreover, we present a\u0000comparative study of the different correlations as a function of doping. We\u0000finally discuss the potential for experimentally observing the studied physics\u0000in quantum materials and heterostructures.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210231","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

Spin freezing induced giant exchange bias in a doped Hund's metal 掺杂亨氏金属中自旋冻结诱导的巨型交换偏置

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04149

S. J. Li, D. Zhao, J. Li, B. L. Kang, M. Shan, Y. B. Zhou, X. Y. Li, T. Wu, X. H. Chen

{"title":"Spin freezing induced giant exchange bias in a doped Hund's metal","authors":"S. J. Li, D. Zhao, J. Li, B. L. Kang, M. Shan, Y. B. Zhou, X. Y. Li, T. Wu, X. H. Chen","doi":"arxiv-2409.04149","DOIUrl":"https://doi.org/arxiv-2409.04149","url":null,"abstract":"Exchange bias (EB) is a fundamental phenomenon in widespread information\u0000technologies. However, a comprehensive understanding of its microscopic origin\u0000remains a great challenge. One key issue in the debate is the role of\u0000frustration and disorder in the EB mechanism, which motivates the exploration\u0000of the EB effect in spin glass (SG) systems. Here,in the SG state of Cr-doped\u0000Hund's metal CsFe2As2, we discover a giant EB effect with a maximum bias field\u0000of ~ 2 Tesla, which is almost two orders of magnitude larger than that of\u0000traditional alloy SGs. Our results indicate that the giant EB effect should\u0000originate from the exchange interactions at the natural boundaries between the\u0000tunable ferromagnetic-like (FM) regions around Cr dopants and the SG matrix,\u0000via which the FM spins are strongly pinned by the frozen spins in the SG\u0000matrix. In addition, the temperature-dependent and cooling-field-dependent EB\u0000behaviors could be interpreted well by the SG model with frustrated FM/SG\u0000boundaries, which provides an intuitive and explicit understanding of the\u0000impact of glassy parameters on the EB effect. All these results suggest that\u0000the correlated metals are promising directions for exploring the EB effect in\u0000the SG state.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210192","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

Superconductivity, topological crystalline insulator and the absence of valence-skipping in AgSnSe$_2$ AgSnSe$_2$ 中的超导性、拓扑晶体绝缘体和不存在价跳现象

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04096

Shubham Patel, A Taraphder

{"title":"Superconductivity, topological crystalline insulator and the absence of valence-skipping in AgSnSe$_2$","authors":"Shubham Patel, A Taraphder","doi":"arxiv-2409.04096","DOIUrl":"https://doi.org/arxiv-2409.04096","url":null,"abstract":"The recent suggestion of valence-skipping phenomenon driving a two-gap\u0000superconductivity in $Ag$-doped SnSe, by Kataria, textit{et al.} [Phys. Rev. B\u0000107, 174517 (2023)], has brought to the fore a long-standing issue once again.\u0000The absence of crystallographically inequivalent Sn cites corroborated by\u0000electronic properties of AgSnSe$_2$, calculated using first-principles density\u0000functional theory, however, does not appear to provide a strong support in\u0000favor of valence-skipping in this system. Interestingly, the signature of\u0000avoided band-crossings (with the inclusion of SOC) and non-zero textit{mirror}\u0000Chern number ($n_{mathcal{M}}$) confirm a non-trivial topology. The presence\u0000of mirror symmetry-protected surface states along the mirror planes indicates\u0000that AgSnSe$_2$ could be a potential candidate for topological crystalline\u0000insulators (TCIs). Moreover, our calculation of electron-phonon coupling and\u0000anisotropic superconducting properties of AgSnSe$_2$, using Migdal-Eliashberg\u0000theory, gives a single-gap superconductivity with critical temperature $T_c\u0000approx 7$K, consistent with the experimental value of $5$K. The interplay of\u0000topology and superconductivity in this three-dimensional material appears quite\u0000intriguing and it may provide new insights into the exploration of\u0000superconductivity and topology.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210187","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

Local Limit Disorder Characteristics of Superconducting Radio Frequency Cavities 超导射频腔的局部极限无序特性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04203

Anastasiya Lebedeva, Matúš Hladký, Marcel Polák, František Herman

{"title":"Local Limit Disorder Characteristics of Superconducting Radio Frequency Cavities","authors":"Anastasiya Lebedeva, Matúš Hladký, Marcel Polák, František Herman","doi":"arxiv-2409.04203","DOIUrl":"https://doi.org/arxiv-2409.04203","url":null,"abstract":"Nowadays superconducting radio frequency (SRF) cavities represent fundamental\u0000tools used for (Standard Model) particle acceleration, (beyond Standard Model)\u0000particle probing and long-lifetime photon preservation. We study the SRF\u0000frequency shift in the vicinity of the critical temperature $T_c$ and the\u0000quality factor mainly at low temperatures within the Dynes superconductor\u0000model. We scrutinize and use the local limit response to the external\u0000electromagnetic field. Our approach allows for a finer analysis of the peculiar\u0000behavior of the resonant frequency shift immensely close to $T_c$, observed in\u0000recent experiments. In the ideal dirty limit, we analytically elaborate on the\u0000width and depth of the resulting dip. Studying the sign of the slope of the\u0000resonant frequency shift at $T_c$ in the moderately clean regime reveals the\u0000role of the pair-breaking and pair-conserving disorder. Next, to find the\u0000relevance of our description, we compare and also fit our results with the\u0000recent experimental data from the N-doped Nb sample presented in\u0000[arXiv:2307.07905v1]. Our analysis remarkably complies with the experimental\u0000findings, especially concerning the dip width. We offer straightforward,\u0000homogeneous-disorder-based interpretation within the moderately clean regime.\u0000Assuming the same regime at low temperatures, we address details of the\u0000high-quality plateaus. Summing all up, this work presents (and studies the\u0000limits of) the simple effective description of the complex problem\u0000corresponding to the electromagnetic response in the superconductors combining\u0000homogeneous conventional pairing and two different kinds of disorder\u0000scattering.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210185","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

Emergence of Superconductivity at 20 K in Th$_3$P$_4$-type In$_{3-x}$S$_4$ Synthesized by Diamond Anvil Cell with Boron-doped Diamond Electrodes 使用掺硼金刚石电极的金刚石砧电池合成的 Th$_3$P$_4$ 型 In$_{3-x}$S$_4$ 在 20 K 时出现超导电性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-05 DOI: arxiv-2409.03409

Ryo Matsumoto, Kazuki Yamane, Terumasa Tadano, Kensei Terashima, Toru Shinmei, Tetsuo Irifune, Yoshihiko Takano

{"title":"Emergence of Superconductivity at 20 K in Th$_3$P$_4$-type In$_{3-x}$S$_4$ Synthesized by Diamond Anvil Cell with Boron-doped Diamond Electrodes","authors":"Ryo Matsumoto, Kazuki Yamane, Terumasa Tadano, Kensei Terashima, Toru Shinmei, Tetsuo Irifune, Yoshihiko Takano","doi":"arxiv-2409.03409","DOIUrl":"https://doi.org/arxiv-2409.03409","url":null,"abstract":"The exploration of superconductors in metastable phases by manipulating\u0000crystal structures through high-pressure techniques has attracted significant\u0000interest in materials science to achieve a high critical temperature ($T_c$).\u0000In this study, we report an emergence of novel superconductivity in a\u0000metastable phase of Th$_3$P$_4$-type cubic In$_{3-x}$S$_4$ with remarkably high\u0000$T_c$ at 20 K under 45 GPa by using an originally designed diamond anvil cell\u0000equipped with boron-doped diamond electrodes, which can perform a high-pressure\u0000synthesis and an in-situ electrical transport measurement simultaneously.\u0000In-situ structural analysis indicates that the In$_{3-x}$S$_4$ appears\u0000partially above 40 GPa without heating. The high-pressure annealing treatment\u0000induces complete transformation to the Th$_3$P$_4$-type structure, and the\u0000defected concentration of x in In$_{3-x}$S$_4$ decreases with increasing\u0000annealing temperature. The $T_c$ in In$_{3-x}$S$_4$ is maximized at x = 0 and\u0000approaches 20 K. Electronic band calculations show that the high density of\u0000states composed of sulfur and indium bands are located at the conduction band\u0000bottom near Fermi energy. The record high $T_c$ in In$_{3-x}$S$_4$ among\u0000superconducting sulfides accelerates the further exploration of high $T_c$\u0000materials within the Th$_3$P$_4$-type cubic family by using flexibility in\u0000crystal structure.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210232","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

Multidimensional Terahertz Probes of Quantum Materials 量子材料的多维太赫兹探针

arXiv - PHYS - Superconductivity Pub Date : 2024-09-05 DOI: arxiv-2409.03719

Albert Liu

引用次数: 0

Competition between the modification of intrinsic superconducting properties and the pinning landscape under external pressure in CaKFe$_4$As$_4$ single crystals CaKFe$_4$As$_4$ 单晶内在超导特性的改变与外压作用下的引脚分布之间的竞争

arXiv - PHYS - Superconductivity Pub Date : 2024-09-05 DOI: arxiv-2409.03809

Shuyuan Huyan, Nestor Haberkorn, Mingyu Xu, Paul C. Canfield, Sergey L. Bud'ko

引用次数: 0

Anisotropic Spin Stripe Domains in Bilayer La$_3$Ni$_2$O$_7$ 双层 La$_3$Ni$_2$O$_7$ 中的各向异性自旋条纹域

arXiv - PHYS - Superconductivity Pub Date : 2024-09-05 DOI: arxiv-2409.03210

N. K Gupta, R. Gong, Y. Wu, M. Kang, C. T. Parzyck, B. Z. Gregory, N. Costa, R. Sutarto, S. Sarker, A. Singer, D. G. Schlom, K. M. Shen, D. G. Hawthorn

引用次数: 0

Stabilization of Ambient Pressure Rocksalt Crystal Structure and High Critical Field Superconductivity in ReC via Mo and W Substitution 通过钼和钨替代稳定 ReC 中的常压岩石盐晶体结构和高临界场超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-05 DOI: arxiv-2409.03592

P. K. Meena, S. Jangid, R. K. Kushwaha, P. Manna, S. Sharma, P. Mishra, R. P. Singh

引用次数: 0

Single photon detection up to 2 um in pair of parallel microstrips based on NbRe ultrathin films 基于 NbRe 超薄薄膜的一对平行微带的单光子探测能力可达 2 um

arXiv - PHYS - Superconductivity Pub Date : 2024-09-04 DOI: arxiv-2409.02619

C. Cirillo, M. Ejrnaes, P. Ercolano, C. Bruscino, A. Cassinese, D. Salvoni, C. Attanasio, G. P. Pepe, L. Parlato

引用次数: 0