Microscopic evidence for anisotropic multigap superconductivity in the CsV3Sb5 kagome superconductor

被引：67

作者：

Gupta, Ritu ^{[1
]}

Das, Debarchan ^{[1
]}

Mielke, Charles Hillis, III ^{[1
]}

Guguchia, Zurab ^{[1
]}

Shiroka, Toni ^{[1
,2
]}

Baines, Christopher ^{[1
]}

Bartkowiak, Marek ^{[3
]}

Luetkens, Hubertus ^{[1
]}

Khasanov, Rustem ^{[1
]}

Yin, Qiangwei ^{[4
,5
]}

Tu, Zhijun ^{[4
,5
]}

Gong, Chunsheng ^{[4
,5
]}

Lei, Hechang ^{[4
,5
]}

机构：

[1] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

[2] Swiss Fed Inst Technol, Lab Festkorperphys, CH-8093 Zurich, Switzerland

[3] Paul Scherrer Inst, Lab Neutron & Muon Instrumentat, CH-5232 Villigen, Switzerland

[4] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

[5] Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China

来源：

NPJ QUANTUM MATERIALS | 2022年 / 7卷 / 01期

基金：

瑞士国家科学基金会; 北京市自然科学基金; 中国国家自然科学基金;

关键词：

MUON SPIN ROTATION; PENETRATION-DEPTH; SINGLE-CRYSTALS; FIELD; BI2.15SR1.85CACU2O8+DELTA; CROSSOVER; CUPRATE; DENSITY; LATTICE; SR;

D O I：

10.1038/s41535-022-00453-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The recently discovered kagome superconductor CsV3Sb5 (T-c similar or equal to 2.5 K) has been found to host charge order as well as a non-trivial band topology, encompassing multiple Dirac points and probable surface states. Such a complex and phenomenologically rich system is, therefore, an ideal playground for observing unusual electronic phases. Here, we report anisotropic superconducting properties of CsV3Sb5 by means of transverse-field muon spin rotation (mu SR) experiments. The fits of temperature dependences of in-plane and out-of-plane components of the magnetic penetration depth suggest that the superconducting order parameter may have a two-gap (s + s)-wave symmetry. The multiband nature of superconductivity could be further supported by the different temperature dependences of the anisotropic magnetic penetration depth gamma lambda(T) and upper critical field Y-Bc2(T). The relaxation rates obtained from zero field mu SR experiments do not show noticeable change across the superconducting transition, indicating that superconductivity does not break time reversal symmetry.

引用

页数：8

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