Oscillating paramagnetic Meissner effect and Berezinskii-Kosterlitz-Thouless transition in underdoped Bi2Sr2CaCu2O8+δ

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外文摘要：Superconducting phase transitions in two dimensions lie beyond the description of the Ginzburg-Landau symmetry-breaking paradigm for three-dimensional superconductors.They are Berezinskii-Kosterlitz-Thouless(BKT)transitions of paired-electron condensate driven by the unbinding of topological excitations,i.e.vortices.The recently discovered monolayers of layered high-transition-temperature(Tc)cuprate superconductor Bi2Sr2CaCu2O8+δ(Bi2212)meant that this 2D superconductor promised to be ideal for the study of unconventional superconductivity.But inhomogeneity posed challenges for distinguishing BKT physics from charge correlations in this material.Here,we utilize the phase sensitivity of scanning superconducting quantum interference device microscopy susceptometry to image the local magnetic response of underdoped Bi2212 from the monolayer to the bulk throughout its phase transition.The monolayer segregates into domains with independent phases at elevated temperatures below Tc.Within a single domain,we find that the susceptibility oscillates with flux between diamagnetism and paramagnetism in a Fraunhofer-like pattern up to Tc.The finite modulation period,as well as the broadening of the peaks when approaching Tc from below,suggests well-defined vortices that are increasingly screened by the dissociation of vortex-antivortex plasma through a BKT transition.In the multilayers,the susceptibility oscillation differs in a small temperature regime below Tc,consistent with a dimensional crossover led by interlayer coupling.Serving as strong evidence for BKT transition in the bulk,we observe a sharp jump in phase stiffness and paramagnetism at small fields just below Tc.These results unify the superconducting phase transitions from the monolayer to the bulk underdoped Bi2212,and can be collectively referred to as the BKT transition with interlayer coupling.

外文关键词：

cuprate superconductormonolayerBerezinskii-Kosterlitz-Thouless transitionscanning SQUIDparamagnetic Meissner effect

作者：

Shiyuan Wang、Yijun Yu、Jinxiang Hao、Keyi Liang、Bingke Xiang、Jinjiang Zhu、Yishi Lin、Yinping Pan、Genda Gu、Kenji Watanabe、Takashi Taniguchi、Yang Qi、Yuanbo Zhang、Yihua Wang

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作者单位：

State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China

Condensed Matter Physics and Materials Science Department,Brookhaven National Laboratory,Upton,NY 11973,USA

Research Center for Functional Materials,National Institute for Materials Science,Tsukuba 305-0044,Japan

International Center for Materials Nanoarchitectonics,National Institute for Materials Science,Tsukuba 305-0044,Japan

Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

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基金：

国家重点研发计划国家自然科学基金国家自然科学基金上海市科技计划重大项目Elemental Strategy Initiative conducted by the Ministry of Education,Culture,Sports,Science and Technology of JapanKAKENHIKAKENHIA3 Foresight by the Japan Society for the Promotion of ScienceUS Department of Energy,Office of Basic Energy Sciences国家自然科学基金国家重点研发计划国家自然科学基金国家自然科学基金中国科学院战略规划重点项目中国博士后科学基金中国博士后科学基金

项目编号：

2021YFA140010011827805121500032019SHZDZX01JPMXP0112101001JP19H05790JP20H00354DOE-sc0012704118741152018YFA0305600U173227411527805XDB30000000BX201800762018M641907

出版年：

2024

DOI：

10.1093/nsr/nwad249

国家科学评论(英文版)

CSTPCD

ISSN：

年,卷(期)：2024.11(5)

参考文献量61