Superconductivity in non-centrosymmetric AuPb3

Meena Shrestha; Matthew Cook; Lance McGowen; Bharat Singh; Keshab Kauchha; Samuel Barczy; Clement A. Burns

doi:10.1016/j.physb.2026.418384

Superconductivity in non-centrosymmetric AuPb₃

Meena Shrestha
, Matthew Cook
, Lance McGowen
, Bharat Singh
, Keshab Kauchha
, Samuel Barczy
, Clement A. Burns

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

Abstract

AuPb₃ is a non-centrosymmetric superconductor with a transition temperature T_c ≈ 4.4 K. Based on general principles, non-centrosymmetric superconductors are predicted to allow unusual superconducting states, such as a mixture of spin-singlet and spin-triplet pairing. We describe material synthesis and measurements of the magnetization, electrical resistivity, and specific heat of AuPb₃. The normal state shows unusual behaviors, including saturating electrical resistivity at high temperatures and a large magnetoresistance. The jump in the electronic specific heat at the superconducting transition and the low temperature specific heat deviate from simple Bardeen-Cooper Schrieffer (BCS) predictions. Data fit best to a multi-gap model.

Original language	English
Article number	418384
Journal	Physica B: Condensed Matter
Volume	728
DOIs	https://doi.org/10.1016/j.physb.2026.418384
State	Published - Apr 15 2026
Externally published	Yes

Funding

We would like to thank Dr. Pnina Ari-Gur of Western Michigan University for use of the PANalytical XRD instrument which was funded by NSF MRI Award 1626276. Funds for the research were provided in part by a FRACAA grant from Western Michigan University. The PPMS used for measurements was funded by NSF MRI grant 1828387. We thank the staff of Beamline 11-BM at the Advanced Photon Source (APS) for taking temperature dependent powder x-ray diffraction data. Use of the APS at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. We acknowledge Andrew Salisbury, Sydney Hyde, and Charles Hinkley for their contributions during our original growth attempts. The reviewers of the manuscript are acknowledged for many helpful suggestions.

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10.1016/j.physb.2026.418384

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title = "Superconductivity in non-centrosymmetric AuPb3",

abstract = "AuPb3 is a non-centrosymmetric superconductor with a transition temperature Tc ≈ 4.4 K. Based on general principles, non-centrosymmetric superconductors are predicted to allow unusual superconducting states, such as a mixture of spin-singlet and spin-triplet pairing. We describe material synthesis and measurements of the magnetization, electrical resistivity, and specific heat of AuPb3. The normal state shows unusual behaviors, including saturating electrical resistivity at high temperatures and a large magnetoresistance. The jump in the electronic specific heat at the superconducting transition and the low temperature specific heat deviate from simple Bardeen-Cooper Schrieffer (BCS) predictions. Data fit best to a multi-gap model.",

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AU - Shrestha, Meena

AU - Cook, Matthew

AU - McGowen, Lance

AU - Singh, Bharat

AU - Kauchha, Keshab

AU - Barczy, Samuel

AU - Burns, Clement A.

PY - 2026/4/15

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N2 - AuPb3 is a non-centrosymmetric superconductor with a transition temperature Tc ≈ 4.4 K. Based on general principles, non-centrosymmetric superconductors are predicted to allow unusual superconducting states, such as a mixture of spin-singlet and spin-triplet pairing. We describe material synthesis and measurements of the magnetization, electrical resistivity, and specific heat of AuPb3. The normal state shows unusual behaviors, including saturating electrical resistivity at high temperatures and a large magnetoresistance. The jump in the electronic specific heat at the superconducting transition and the low temperature specific heat deviate from simple Bardeen-Cooper Schrieffer (BCS) predictions. Data fit best to a multi-gap model.

AB - AuPb3 is a non-centrosymmetric superconductor with a transition temperature Tc ≈ 4.4 K. Based on general principles, non-centrosymmetric superconductors are predicted to allow unusual superconducting states, such as a mixture of spin-singlet and spin-triplet pairing. We describe material synthesis and measurements of the magnetization, electrical resistivity, and specific heat of AuPb3. The normal state shows unusual behaviors, including saturating electrical resistivity at high temperatures and a large magnetoresistance. The jump in the electronic specific heat at the superconducting transition and the low temperature specific heat deviate from simple Bardeen-Cooper Schrieffer (BCS) predictions. Data fit best to a multi-gap model.

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DO - 10.1016/j.physb.2026.418384

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VL - 728

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

M1 - 418384

ER -

Superconductivity in non-centrosymmetric AuPb₃

Abstract

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