Observation of the non-linear Meissner effect

被引：6

作者：

Wilcox, J. A. ^{[1
]}

Grant, M. J. ^{[1
]}

Malone, L. ^{[1
]}

Putzke, C. ^{[1
,7
]}

Kaczorowski, D. ^{[2
]}

Wolf, T. ^{[3
]}

Hardy, F. ^{[3
]}

Meingast, C. ^{[3
]}

Analytis, J. G. ^{[4
,5
,6
,8
]}

Chu, J. -H. ^{[4
,5
,6
,9
]}

Fisher, I. R. ^{[4
,5
,6
]}

Carrington, A. ^{[1
]}

机构：

[1] Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8 1TL, Avon, England

[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

[3] Karlsruhe Inst Technol, Inst Quantum Mat & Technol, D-76021 Karlsruhe, Germany

[4] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[5] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[6] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, Menlo Pk, CA 94025 USA

[7] Ecole Polytech Fed Lausanne EPFL, Inst Mat, Lab Quantum Mat, CH-1015 Lausanne, Switzerland

[8] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[9] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

MAGNETIC PENETRATION DEPTH; SUPERCONDUCTORS; TEMPERATURE; DEPENDENCE; YBA2CU3O6.95; CECOIN5;

D O I：

10.1038/s41467-022-28790-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The non-linear Meissner effect is a key manifestation of unconventional nodal superconductors but its experimental evidence has been elusive. Here, the authors observe the nonlinear Meissner effect in nodal superconductors CeCoIn5 and LaFePO. A long-standing theoretical prediction is that in clean, nodal unconventional superconductors the magnetic penetration depth lambda, at zero temperature, varies linearly with magnetic field. This non-linear Meissner effect is an equally important manifestation of the nodal state as the well studied linear-in-T dependence of lambda, but has never been convincingly experimentally observed. Here we present measurements of the nodal superconductors CeCoIn5 and LaFePO which clearly show this non-linear Meissner effect. We further show how the effect of a small dc magnetic field on lambda(T) can be used to distinguish gap nodes from non-nodal deep gap minima. Our measurements of KFe2As2 suggest that this material has such a non-nodal state.

引用

页数：6

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