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.He...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 TaIr_(2)B_(2)(with T_(c)=5.1 K),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 TaIr_(2)B_(2)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.展开更多
基金supported by the National Science Center(Poland),Grant No.2022/45/B/ST5/03916The work at Slovak Academy of Sciences was supported by Projects APVV-23-0624,VEGA 2/0073/24,COST Action No.CA21144(SUPERQUMAP),Slovak Academy of Sciences Project IMPULZ IM-2021-42.
文摘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 TaIr_(2)B_(2)(with T_(c)=5.1 K),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 TaIr_(2)B_(2)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.
