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

V. K. Anand; A. Bhattacharyya; D. T. Adroja; K. Panda; P. K. Biswas; A. D. Hillier; B. Lake

doi:10.1103/PhysRevB.108.224519

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

V. K. Anand, A. Bhattacharyya, D. T. Adroja, K. Panda, P. K. Biswas, A. D. Hillier, B. Lake

Physics

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

CaPd2Ge2 which crystallizes in ThCr2Si2-type body-centered tetragonal structure exhibits superconductivity below the critical temperature Tc=1.69K. We have investigated the superconducting gap structure and time-reversal symmetry of the ground state in CaPd2Ge2 by means of muon spin relaxation and rotation (μSR) measurements. Our analysis of μSR 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 2Δ(0)/kBTc=3.50(1). Further, an increased relaxation rate in zero-field μSR 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.

Original language	English
Article number	224519
Journal	Physical Review B
Volume	108
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.108.224519
Publication status	Published - 1 Dec 2023

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.108.224519

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title = "Time-reversal symmetry breaking and s-wave superconductivity in CaPd2Ge2: A μsR study",

abstract = "CaPd2Ge2 which crystallizes in ThCr2Si2-type body-centered tetragonal structure exhibits superconductivity below the critical temperature Tc=1.69K. We have investigated the superconducting gap structure and time-reversal symmetry of the ground state in CaPd2Ge2 by means of muon spin relaxation and rotation (μSR) measurements. Our analysis of μSR 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 2Δ(0)/kBTc=3.50(1). Further, an increased relaxation rate in zero-field μSR 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.",

author = "Anand, {V. K.} and A. Bhattacharyya and Adroja, {D. T.} and K. Panda and Biswas, {P. K.} and Hillier, {A. D.} and B. Lake",

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T2 - A μsR study

AU - Anand, V. K.

AU - Bhattacharyya, A.

AU - Adroja, D. T.

AU - Panda, K.

AU - Biswas, P. K.

AU - Hillier, A. D.

AU - Lake, B.

PY - 2023/12/1

Y1 - 2023/12/1

N2 - CaPd2Ge2 which crystallizes in ThCr2Si2-type body-centered tetragonal structure exhibits superconductivity below the critical temperature Tc=1.69K. We have investigated the superconducting gap structure and time-reversal symmetry of the ground state in CaPd2Ge2 by means of muon spin relaxation and rotation (μSR) measurements. Our analysis of μSR 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 2Δ(0)/kBTc=3.50(1). Further, an increased relaxation rate in zero-field μSR 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.

AB - CaPd2Ge2 which crystallizes in ThCr2Si2-type body-centered tetragonal structure exhibits superconductivity below the critical temperature Tc=1.69K. We have investigated the superconducting gap structure and time-reversal symmetry of the ground state in CaPd2Ge2 by means of muon spin relaxation and rotation (μSR) measurements. Our analysis of μSR 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 2Δ(0)/kBTc=3.50(1). Further, an increased relaxation rate in zero-field μSR 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.

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

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