2021/05/17 by T. Shang, Tian Shang, W. Xie +13
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Critical field #Crystallography #Iron-based superconductors research #Magnetic field #Magnetization #Materials science #Muon spin spectroscopy #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Rhenium #Superconductivity #Superfluidity #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.103.184517
published as Phys. Rev. B.103, 184517 (2021) · 9 pages, 6 figures, accepted by Phys. Rev. B
arxiv created 2021/05/17 · openalex created_date 2021/05/24 · openalex publication_date 2021/05/28 · arxiv updated 2021/05/31 · openalex updated_date 2026/08/06
We report a comprehensive study of the centrosymmetric Re3B and noncentrosymmetric Re7B3 superconductors. At a macroscopic level, their bulk superconductivity (SC), with Tc=5.1\phantom\rule0.16em0exK (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 (\ensuremathμSR). In both Re3B and Re7B3 the low-T zero-field electronic specific heat and the superfluid density (determined via transverse-field \ensuremathμSR) suggest a nodeless SC. Both compounds exhibit some features of multigap SC, as evidenced by the temperature-dependent upper critical fields Hc2(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 \ensuremathμSR 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.