Time-reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A μSR study

被引：3

作者：

Anand, V. K. ^{[1
,2
,3
]}

Bhattacharyya, A. ^{[4
]}

Adroja, D. T. ^{[5
,6
]}

Panda, K. ^{[7
]}

Biswas, P. K. ^{[5
]}

Hillier, A. D. ^{[5
]}

Lake, B. ^{[1
]}

机构：

[1] Helmholtz Zentrum Berlin Mat & Energie GmbH, Hahn Meitner Pl 1, D-14109 Berlin, Germany

[2] Univ Petr & Energy Studies, Dept Phys, Dehra Dun 248007, Uttarakhand, India

[3] Univ Stavanger, Dept Math & Phys, N-4036 Stavanger, Norway

[4] Ramakrishna Mission Vivekananda Educ & Res Inst, Dept Phys, Howrah 711202, W Bengal, India

[5] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[6] Univ Johannesburg, Phys Dept, Highly Correlated Matter Res Grp, POB 524, ZA-2006 Auckland Pk, South Africa

[7] Ariel Univ, Dept Phys, IL-40700 Ariel, Israel

来源：

PHYSICAL REVIEW B | 2023年 / 108卷 / 22期

基金：

英国工程与自然科学研究理事会;

关键词：

MAGNETIC PENETRATION DEPTH; TEMPERATURE; DENSITY; TC;

D O I：

10.1103/PhysRevB.108.224519

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

CaPd2Ge2 which crystallizes in ThCr2Si2-type body-centered tetragonal structure exhibits superconductivity below the critical temperature Tc = 1.69 K. We have investigated the superconducting gap structure and timereversal symmetry of the ground state in CaPd2Ge2 by means of muon spin relaxation and rotation (mu SR) measurements. Our analysis of mu SR data collected in a transverse magnetic field reveals BCS superconductivity with a single-band s-wave singlet pairing and an isotropic energy gap having the value 2 ⠂(0)/kBTc = 3.50(1). Further, an increased relaxation rate in zero-field mu SR asymmetry spectra below Tc provides evidence for the presence of a spontaneous magnetic field in the superconducting state, revealing that the time-reversal symmetry is broken in CaPd2Ge2.

引用

页数：7

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