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
Article number	100167
Journal	Superconductivity
Volume	14
DOIs	https://doi.org/10.1016/j.supcon.2025.100167
Publication status	Published - 1 Jun 2025
Externally published	Yes

Keywords

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

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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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title = "Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr2B2",

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, STM spectroscopy, Spin–orbit coupling, Upper critical magnetic field",

author = "J. Ka{\v c}mar{\v c}{\'i}k and Z. Pribulov{\'a} and T. Shiroka and F. Ko{\v s}uth and P. Szab{\'o} and Winiarski, \{M. J.\} and S. Kr{\'o}lak and J. Jaroszynski and T. Shang and Cava, \{R. J.\} and C. Marcenat and T. Klein and T. Klimczuk and P. Samuely",

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year = "2025",

month = jun,

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

language = "English",

volume = "14",

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T1 - Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr2B2

AU - Kačmarčík, J.

AU - Pribulová, Z.

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.

PY - 2025/6/1

Y1 - 2025/6/1

N2 - 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.

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.

KW - Multiband/multigap superconductivity

KW - Muon-spin spectroscopy

KW - Non-centrosymmetric superconductors

KW - Pauli limit

KW - STM spectroscopy

KW - Spin–orbit coupling

KW - Upper critical magnetic field

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DO - 10.1016/j.supcon.2025.100167

M3 - Article

AN - SCOPUS:105003235952

SN - 2772-8307

VL - 14

JO - Superconductivity

JF - Superconductivity

M1 - 100167

ER -

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

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Keywords

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