Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr2B2

J. Kačmarčík; Z. Pribulová; T. Shiroka; F. Košuth; P. Szabó; M. J. Winiarski; S. Królak; J. Jaroszynski; T. Shang; R. J. Cava; C. Marcenat; T. Klein; T. Klimczuk; P. Samuely

doi:10.1016/j.supcon.2025.100167

Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr₂B₂

J. Kačmarčík, Z. Pribulová, T. Shiroka, F. Košuth, P. Szabó, M. J. Winiarski, S. Królak, J. Jaroszynski, T. Shang, R. J. Cava, C. Marcenat, T. Klein, T. Klimczuk, P. Samuely

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

Abstract

Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties, including mixed-parity pairing and very high upper critical fields. Here, we present a comprehensive study of TaIr₂B₂ (with T_c=5.1K), using a set of complementary experimental methods, including bulk- and surface-sensitive techniques. We provide evidence that this system is a two-band, yet it behaves as a single-gap superconductor with a strong coupling. The upper critical field of TaIr₂B₂ significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures. This behavior, rarely seen in superconductors, is discussed in terms of anti-symmetric spin–orbit interaction, two-band-, and strong-coupling effects, as well as disorder.

Original language	English (US)
Article number	100167
Journal	Superconductivity
Volume	14
DOIs	https://doi.org/10.1016/j.supcon.2025.100167
State	Published - Jun 2025

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Keywords

Multiband/multigap superconductivity
Muon-spin spectroscopy
Non-centrosymmetric superconductors
Pauli limit
Spin–orbit coupling
STM spectroscopy
Upper critical magnetic field

Access to Document

10.1016/j.supcon.2025.100167

Cite this

Kačmarčík, J., Pribulová, Z., Shiroka, T., Košuth, F., Szabó, P., Winiarski, M. J., Królak, S., Jaroszynski, J., Shang, T., Cava, R. J., Marcenat, C., Klein, T., Klimczuk, T., & Samuely, P. (2025). Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr₂B₂. Superconductivity, 14, Article 100167. https://doi.org/10.1016/j.supcon.2025.100167

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abstract = "Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties, including mixed-parity pairing and very high upper critical fields. Here, we present a comprehensive study of TaIr2B2 (with Tc=5.1K), using a set of complementary experimental methods, including bulk- and surface-sensitive techniques. We provide evidence that this system is a two-band, yet it behaves as a single-gap superconductor with a strong coupling. The upper critical field of TaIr2B2 significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures. This behavior, rarely seen in superconductors, is discussed in terms of anti-symmetric spin–orbit interaction, two-band-, and strong-coupling effects, as well as disorder.",

keywords = "Multiband/multigap superconductivity, Muon-spin spectroscopy, Non-centrosymmetric superconductors, Pauli limit, Spin–orbit coupling, STM spectroscopy, Upper critical magnetic field",

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doi = "10.1016/j.supcon.2025.100167",

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AU - Shiroka, T.

AU - Košuth, F.

AU - Szabó, P.

AU - Winiarski, M. J.

AU - Królak, S.

AU - Jaroszynski, J.

AU - Shang, T.

AU - Cava, R. J.

AU - Marcenat, C.

AU - Klein, T.

AU - Klimczuk, T.

AU - Samuely, P.

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AB - Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties, including mixed-parity pairing and very high upper critical fields. Here, we present a comprehensive study of TaIr2B2 (with Tc=5.1K), using a set of complementary experimental methods, including bulk- and surface-sensitive techniques. We provide evidence that this system is a two-band, yet it behaves as a single-gap superconductor with a strong coupling. The upper critical field of TaIr2B2 significantly exceeds the Pauli limit and exhibits a nearly linear temperature dependence down to the lowest temperatures. This behavior, rarely seen in superconductors, is discussed in terms of anti-symmetric spin–orbit interaction, two-band-, and strong-coupling effects, as well as disorder.

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