期刊
PHYSICAL REVIEW B
卷 103, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.184517
关键词
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资金
- East-China Normal University (ECNU)
- Swiss SNF Grants [200021-169455, 206021-139082]
- Sino-Swiss Science and Technology Cooperation [IZLCZ2170075]
- National Key R&D Program of China [2017YFA0303100, 2016YFA0300202]
- Key R&D Program of Zhejiang Province, China [2021C01002]
- National Natural Science Foundation of China [11974306]
A comprehensive study of centrosymmetric Re3B and noncentrosymmetric Re7B3 superconductors revealed that both compounds exhibit nodeless superconductivity and features of multigap superconductivity, while maintaining time-reversal symmetry in the superconducting state.
We report a comprehensive study of the centrosymmetric Re3B and noncentrosymmetric Re7B3 superconductors. At a macroscopic level, their bulk superconductivity (SC), with T-c = 5.1K (Re3B) and 3.3 K (Re7B3), was characterized via electrical-resistivity, magnetization, and heat-capacity measurements, while their microscopic superconducting properties were investigated by means of muon-spin rotation and relaxation (mu SR). In both Re3B and Re7B3 the low-T zero-field electronic specific heat and the superfluid density (determined via transverse-field mu SR) suggest a nodeless SC. Both compounds exhibit some features of multigap SC, as evidenced by the temperature-dependent upper critical fields Hc(2)(T), as well as by electronic band-structure calculations. The absence of spontaneous magnetic fields below the onset of SC, as determined from zero-field mu SR measurements, indicates a preserved time-reversal symmetry in the superconducting state of both Re3B and Re7B3. Our results suggest that a lack of inversion symmetry and the accompanying antisymmetric spin-orbit coupling effects are not essential for the occurrence of multigap SC in these rhenium-boron compounds.
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