arXiv - PHYS - Superconductivity最新文献_第5页

Planar Hall supercurrent and δφ-shift in the topological Josephson junction 拓扑约瑟夫森结中的平面霍尔超电流和 δφ 移位

arXiv - PHYS - Superconductivity Pub Date : 2024-09-07 DOI: arxiv-2409.04848

Morteza Salehi

引用次数: 0

Nodal Nematic Superconductivity in Multiple-Flat-Band Land 多平带陆地中的节点向列超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-07 DOI: arxiv-2409.04917

Chao-Xing Liu, B. Andrei Bernevig

引用次数: 0

FePd2Te2: An Anisotropic Two-Dimensional Ferromagnet with One-Dimensional Fe Chains FePd2Te2：带有一维铁链的各向异性二维铁磁体

arXiv - PHYS - Superconductivity Pub Date : 2024-09-07 DOI: arxiv-2409.04800

Bingxian Shi, Yanyan Geng, Hengning Wang, Jianhui Yang, Chenglin Shang, Manyu Wang, Shuo Mi, Jiale Huang, Feihao Pan, Xuejuan Gui, Jinchen Wang, Juanjuan Liu, Daye Xu, Hongxia Zhang, Jianfei Qin, Hongliang Wang, Lijie Hao, Mingliang Tian, Zhihai Cheng, Guolin Zheng, Peng Cheng

{"title":"FePd2Te2: An Anisotropic Two-Dimensional Ferromagnet with One-Dimensional Fe Chains","authors":"Bingxian Shi, Yanyan Geng, Hengning Wang, Jianhui Yang, Chenglin Shang, Manyu Wang, Shuo Mi, Jiale Huang, Feihao Pan, Xuejuan Gui, Jinchen Wang, Juanjuan Liu, Daye Xu, Hongxia Zhang, Jianfei Qin, Hongliang Wang, Lijie Hao, Mingliang Tian, Zhihai Cheng, Guolin Zheng, Peng Cheng","doi":"arxiv-2409.04800","DOIUrl":"https://doi.org/arxiv-2409.04800","url":null,"abstract":"Two-dimensional (2D) magnets have attracted significant attentions in recent\u0000years due to their importance in the research on both fundamental physics and\u0000spintronic applications. Here, we report the discovery of a new ternary\u0000compound FePd2Te2. It features a layered quasi-2D crystal structure with\u0000one-dimensional Fe zigzag chains extending along the b-axis in the cleavage\u0000plane. Single crystals of FePd2Te2 with centimeter-size could be grown. Density\u0000functional theory calculations, mechanical exfoliation and atomic force\u0000microscopy on these crystals reveal that they are 2D materialsthat can be\u0000thinned down to 5 nm. Magnetic characterization shows that FePd2Te2 is an\u0000easy-plane ferromagnet with Tc 183 K and strong in-plane uniaxial magnetic\u0000anisotropy. Magnetoresistance and anomalous Hall effect demonstrate that\u0000ferromagnetism could maintain in FePd2Te2 flakes with large coercivity. A\u0000crystal twinning effect is observed by scanning tunneling microscopy which\u0000makes the Fe chains right-angle bent in the cleavage plane and creates an\u0000intriguing spin texture. Our results show that FePd2Te2 is a correlated\u0000anisotropic 2D magnets that may attract multidisciplinary research interests.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210183","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

Resolving the Electronic Ground State of La3Ni2O7-δ Films 解析 La3Ni2O7-δ 薄膜的电子基态

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04121

Xiaolin Ren, Ronny Sutarto, Xianxin Wu, Jianfeng Zhang, Hai Huang, Tao Xiang, Jiangping Hu, Riccardo Comin, X. J. Zhou, Zhihai Zhu

{"title":"Resolving the Electronic Ground State of La3Ni2O7-δ Films","authors":"Xiaolin Ren, Ronny Sutarto, Xianxin Wu, Jianfeng Zhang, Hai Huang, Tao Xiang, Jiangping Hu, Riccardo Comin, X. J. Zhou, Zhihai Zhu","doi":"arxiv-2409.04121","DOIUrl":"https://doi.org/arxiv-2409.04121","url":null,"abstract":"The recent discovery of a superconductivity signature in La3Ni2O7-{delta}\u0000under a pressure of 14 GPa, with a superconducting transition temperature of\u0000around 80 K, has attracted considerable attention. An important aspect of\u0000investigating electronic structures is discerning the extent to which the\u0000electronic ground state of La3Ni2O7-{delta} resembles the parent state of the\u0000cuprate superconductor, a charge transfer insulator with long-range\u0000antiferromagnetism. Through X-ray absorption spectroscopy, we have uncovered\u0000the crucial influence of oxygen ligands on the electronic ground states of the\u0000Ni ions, displaying a charge transfer nature akin to cuprate but with distinct\u0000orbital configurations. Both in-plane and out-of-plane Zhang-Rice singlets\u0000associated with Ni d_(x^2-y^2 ) and d_(z^2) orbitals are identified, together\u0000with a strong interlayer coupling through inner apical oxygen. Additionally, in\u0000La3Ni2O7-{delta} films, we have detected a superlattice reflection (1/4, 1/4,\u0000L) at the Ni L absorption edge using resonant X-ray scattering measurements.\u0000Further examination of the resonance profile indicates that the reflection\u0000originates from the Ni d orbitals. By evaluating the reflection's azimuthal\u0000angle dependence, we have confirmed the presence of collinear antiferromagnetic\u0000spin ordering and charge-like anisotropy ordered with the same periodicity.\u0000Notably, our findings reveal a microscopic relationship between these two\u0000components in the temperature dependence of the scattering intensity of the\u0000reflection. This investigation enriches our understanding of high-temperature\u0000superconductivity in La3Ni2O7-{delta} under high pressure.","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":"142210186","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

Anomalous Superconductivity in Twisted MoTe2 Nanojunctions 扭曲 MoTe2 纳米结中的反常超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04594

Yanyu Jia, Tiancheng Song, Zhaoyi Joy Zheng, Guangming Cheng, Ayelet J Uzan, Guo Yu, Yue Tang, Connor J. Pollak, Fang Yuan, Michael Onyszczak, Kenji Watanabe, Takashi Taniguchi, Shiming Lei, Nan Yao, Leslie M Schoop, N. P. Ong, Sanfeng Wu

{"title":"Anomalous Superconductivity in Twisted MoTe2 Nanojunctions","authors":"Yanyu Jia, Tiancheng Song, Zhaoyi Joy Zheng, Guangming Cheng, Ayelet J Uzan, Guo Yu, Yue Tang, Connor J. Pollak, Fang Yuan, Michael Onyszczak, Kenji Watanabe, Takashi Taniguchi, Shiming Lei, Nan Yao, Leslie M Schoop, N. P. Ong, Sanfeng Wu","doi":"arxiv-2409.04594","DOIUrl":"https://doi.org/arxiv-2409.04594","url":null,"abstract":"Introducing superconductivity in topological materials can lead to innovative\u0000electronic phases and device functionalities. Here, we present a new strategy\u0000for quantum engineering of superconducting junctions in moire materials through\u0000direct, on-chip, and fully encapsulated 2D crystal growth. We achieve robust\u0000and designable superconductivity in Pd-metalized twisted bilayer molybdenum\u0000ditelluride (MoTe2) and observe anomalous superconducting effects in\u0000high-quality junctions across ~ 20 moire cells. Surprisingly, the junction\u0000develops enhanced, instead of weakened, superconducting behaviors, exhibiting\u0000fluctuations to a higher critical magnetic field compared to its adjacent\u0000Pd7MoTe2 superconductor. Additionally, the critical current further exhibits a\u0000striking V-shaped minimum at zero magnetic field. These features are unexpected\u0000in conventional Josephson junctions and indeed absent in junctions of natural\u0000bilayer MoTe2 created using the same approach. We discuss implications of these\u0000observations, including the possible formation of mixed even- and odd-parity\u0000superconductivity at the moire junctions. Our results also demonstrate a\u0000pathway to engineer and investigate superconductivity in fractional Chern\u0000insulators.","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":"142210179","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

O-bridged electron pairing: the microscopic mechanism for high-temperature superconductivity in cuprates and nickelates O 桥电子配对：铜酸盐和镍酸盐高温超导的微观机制

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04036

Jun-jie Shi, Yao-hui Zhu

引用次数: 0

Topological Quantum Materials with Kagome Lattice 具有鹿目晶格的拓扑量子材料

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04211

Qi Wang, Hechang Lei, Yanpeng Qi, Claudia Felser

{"title":"Topological Quantum Materials with Kagome Lattice","authors":"Qi Wang, Hechang Lei, Yanpeng Qi, Claudia Felser","doi":"arxiv-2409.04211","DOIUrl":"https://doi.org/arxiv-2409.04211","url":null,"abstract":"In this account, we will give an overview of our research progress on novel\u0000quantum properties in topological quantum materials with kagome lattice. Here,\u0000there are mainly two categories of kagome materials: magnetic kagome materials\u0000and nonmagnetic ones. On one hand, magnetic kagome materials mainly focus on\u0000the 3d transition-metal-based kagome systems, including Fe$_3$Sn$_2$,\u0000Co$_3$Sn$_2$S$_2$, YMn6Sn6, FeSn, and CoSn. The interplay between magnetism and\u0000topological bands manifests vital influence on the electronic response. For\u0000example, the existence of massive Dirac or Weyl fermions near the Fermi level\u0000signicantly enhances the magnitude of Berry curvature in momentum space,\u0000leading to a large intrinsic anomalous Hall effect. In addition, the peculiar\u0000frustrated structure of kagome materials enables them to host a topologically\u0000protected skyrmion lattice or noncoplaner spin texture, yielding a topological\u0000Hall effect that arises from the realspace Berry phase. On the other hand,\u0000nonmagnetic kagome materials in the absence of longrange magnetic order include\u0000CsV3Sb5 with the coexistence of superconductivity, charge density wave state,\u0000and band topology and van der Waals semiconductor Pd$_3$P$_2$S$_8$. For these\u0000two kagome materials, the tunability of electric response in terms of high\u0000pressure or carrier doping helps to reveal the interplay between electronic\u0000correlation effects and band topology and discover the novel emergent quantum\u0000phenomena in kagome materials.","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":"142210184","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

Observation of superconducting diode effect in antiferromagnetic Mott insulator $α$-RuCl$_3$ 观测反铁磁性莫特绝缘体 $α$-RuCl$_3$ 中的超导二极管效应

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04093

Jiadian He, Yifan Ding, Xiaohui Zeng, Yiwen Zhang, Yanjiang Wang, Peng Dong, Xiang Zhou, Yueshen Wu, Kecheng Cao, Kejing Ran, Jinghui Wang, Yulin Chen, Kenji Watanabe, Takashi Taniguchi, Shun-Li Yu, Jian-Xin Li, Jinsheng Wen, Jun Li

{"title":"Observation of superconducting diode effect in antiferromagnetic Mott insulator $α$-RuCl$_3$","authors":"Jiadian He, Yifan Ding, Xiaohui Zeng, Yiwen Zhang, Yanjiang Wang, Peng Dong, Xiang Zhou, Yueshen Wu, Kecheng Cao, Kejing Ran, Jinghui Wang, Yulin Chen, Kenji Watanabe, Takashi Taniguchi, Shun-Li Yu, Jian-Xin Li, Jinsheng Wen, Jun Li","doi":"arxiv-2409.04093","DOIUrl":"https://doi.org/arxiv-2409.04093","url":null,"abstract":"Nonreciprocal superconductivity, also called as superconducting diode effect\u0000that spontaneously breaks time-reversal symmetry, is characterized by\u0000asymmetric critical currents under opposite applied current directions. This\u0000distinct state unveils a rich ore of intriguing physical properties,\u0000particularly in the realm of nanoscience application of superconductors.\u0000Towards the experimental realization of superconducting diode effect, the\u0000construction of two-dimensional heterostructures of magnets and $s$-wave\u0000superconductors is considered to be a promising pathway. In this study, we\u0000present our findings of superconducting diode effect manifested in the magnetic\u0000Mott insulator $alpha$-RuCl$_3$. This phenomenon is induced by the proximity\u0000effect within a van der Waals heterostructure, consisting of thin\u0000$alpha$-RuCl$_3$/NbSe$_2$ flakes. Through transport property measurements, we\u0000have confirmed a weak superconducting gap of 0.2 meV, which is significantly\u0000lower than the intrinsic gap of NbSe$_2$(1.2 meV). Upon the application of a\u0000weak magnetic field below 70 mT, we observed an asymmetry in the critical\u0000currents under positive and negative applied currents. This observation\u0000demonstrates a typical superconducting diode effect in the superconducting\u0000$alpha$-RuCl$_3$. The superconducting diode effect and nonreciprocal\u0000resistance are observed exclusively when the magnetic field is aligned\u0000out-of-plane. This suggests that an Ising-type spin-orbit coupling in the\u0000superconducting $alpha$-RuCl$_3$ may be responsible for the mechanism. Our\u0000findings furnish a platform for the exploration of superconducting diode effect\u0000via the artificial construction of 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":"142210188","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

Magnetic proximity effect in superconductor/ferromagnet van der Waals heterostructures: dependence on the number of superconducting monolayers 超导体/铁磁体范德华异质结构中的磁接近效应：与超导单层数量的关系

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04227

A. S. Ianovskaia, G. A. Bobkov, A. M. Bobkov, I. V. Bobkova

{"title":"Magnetic proximity effect in superconductor/ferromagnet van der Waals heterostructures: dependence on the number of superconducting monolayers","authors":"A. S. Ianovskaia, G. A. Bobkov, A. M. Bobkov, I. V. Bobkova","doi":"arxiv-2409.04227","DOIUrl":"https://doi.org/arxiv-2409.04227","url":null,"abstract":"The magnetic proximity effect in superconductor/ferromagnet (S/F)\u0000heterostructures leads to a suppression of the superconducting order parameter\u0000and appearance of spin splitting of the local electronic density of states\u0000(LDOS). In classical thin-film heterostructures with a large number of atomic\u0000layers it has been well studied. However, with the discovery of 2D materials\u0000that open up unprecedented opportunities for the design of new functional\u0000materials, an intensive study of proximity effects in van der Waals (vdW) S/F\u0000heterostructures has begun. In particular, it was shown that in monolayer\u0000S/monolayer F heterostructures the physical mechanism of the proximity effect\u0000is determined by the hybridization of their electronic states, what makes its\u0000observable manifestations completely different from the classical results and\u0000allows for effective control over the proximity effect using gate voltage. Here\u0000we demonstrate that the hybridization mechanism of the proximity effect clearly\u0000manifests itself in the evolution of the magnetic proximity effect in vdW S/F\u0000heterostructures with varying number of the superconducting layers. In\u0000particular, the number of superconducting layers determines the number of\u0000minima in the dependence of the order parameter on the ferromagnetic exchange\u0000field and gating. The spin splitting of the LDOS is very unusual and in general\u0000cannot be described by an effective Zeeman field. Physical reasons of such a\u0000behavior and possible experimental manifestations are discussed in details.","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":"142210189","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

Strong local variational approach for superconductivity theory, and the principles of coherent interaction and action-counteraction 超导理论的强局部变分法，以及相干相互作用和作用-反作用原理

arXiv - PHYS - Superconductivity Pub Date : 2024-09-06 DOI: arxiv-2409.04317

ChaoFan Yu, Xuyang Chen, ZhiHua Luo

{"title":"Strong local variational approach for superconductivity theory, and the principles of coherent interaction and action-counteraction","authors":"ChaoFan Yu, Xuyang Chen, ZhiHua Luo","doi":"arxiv-2409.04317","DOIUrl":"https://doi.org/arxiv-2409.04317","url":null,"abstract":"For the two-mode electron pairing, we propose a local stacking force pairing\u0000mechanism driven by strong local fluctuations, with two straight pairing orbits\u0000where the tying Cooper pairing $C_{-kdownarrow}C_{kuparrow}e^{ikcdot r}$\u0000replaces the itinerant pairing. Based on coherent interaction and\u0000action-counteraction principles, the strong local variational theory is\u0000constructed, with the energy extremum and gap equations forming self-consistent\u0000pairs, involving the local variational parameter $lambda$, energy gap\u0000$Delta$, and the energy cut-off $hbar omega_0$. As $hbar omega_0(j)$\u0000approaches its cut-off, $lambda$ and $Delta$ converge to fixed values. The\u0000theory predicts that the coupling strength $Vg(0)$ reduces to\u0000$tilde{V}g(0)=e^{-left(1-alpha_{1}right)^{2} k^{2} / 4 lambda^{2}} Vg(0)$,\u0000and the Cooper pair reduces similarly. For weak coupling, $alpha_1=1$, and\u0000when $Vg(0)=0.1$, $Delta_{mathrm{A cdot C}}=108 Delta_{text{BCS}}$, but\u0000$Delta_{mathrm{A cdot C}}$ decreases to $28 Delta_{text{BCS}}$ at\u0000$Vg(0)=0.2$. For strong coupling, $alpha_1=0$, if $Vg(0)=1.4$, $tilde{V}\u0000g(0)$ reduces to 0.2, and the smaller Cooper pair $widetilde{C_{k uparrow}\u0000C_{-k downarrow}}$ reduces to $0.14 C_{k uparrow} C_{-k downarrow}$.\u0000Additionally, $Delta_{mathrm{A cdot C}} = 0.5676~text{eV} gg hbar\u0000omega_{text{D}}$, and the local stacking force is\u0000$widetilde{V}_{text{st}}=0.264 ~text{eV}$. With $k^2/lambda^2 =$ const, the\u0000local strength increases, causing the stacking force to grow significantly.\u0000Thus, $hbar omega_0$ and $Delta$ yield a unique solution.","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":"142210233","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