TY - JOUR
T1 - Superconductivity of MoBe22 and WBe22 at ambient- A nd under applied-pressure conditions
AU - Shiroka, T.
AU - Shang, T.
AU - Juckel, M.
AU - Krnel, M.
AU - König, M.
AU - Burkhardt, U.
AU - KoŽelj, P.
AU - Gupta, R.
AU - Prots, Yu
AU - Svanidze, E.
N1 - Publisher Copyright:
© 2022 authors. Published by the American Physical Society.
PY - 2022/6
Y1 - 2022/6
N2 - MoBe22 and WBe22 compounds belong to the binary XBe22 (X=4d or 5d metal) family of superconductors, whose critical temperature depends strongly on X. Despite the multiphase nature of these samples, it is possible to investigate the superconducting properties of MoBe22 and WBe22 at the macro- A nd microscopic level. A concurrent analysis by means of magnetization and heat-capacity measurements, as well as muon-spin spectroscopy (μSR) was implemented. At ambient pressure, both compounds enter the superconducting state below 2.6±0.1 K (MoBe22) and 4.1±0.10 K (WBe22) and show modest upper critical fields [(μ0Hc2(0)=48±1 mT and μ0Hc2(0)=58±1 mT, respectively]. In WBe22, the temperature-dependent superfluid density suggests a fully gapped superconducting state, well-described by an s-wave model with a single energy gap. Heat-capacity data confirm that such a model applies to both compounds. Finally, ac magnetic susceptibility measurements under applied pressures up to 2.1 GPa reveal a linear suppression of the superconducting temperature, typical of conventional superconducting compounds.
AB - MoBe22 and WBe22 compounds belong to the binary XBe22 (X=4d or 5d metal) family of superconductors, whose critical temperature depends strongly on X. Despite the multiphase nature of these samples, it is possible to investigate the superconducting properties of MoBe22 and WBe22 at the macro- A nd microscopic level. A concurrent analysis by means of magnetization and heat-capacity measurements, as well as muon-spin spectroscopy (μSR) was implemented. At ambient pressure, both compounds enter the superconducting state below 2.6±0.1 K (MoBe22) and 4.1±0.10 K (WBe22) and show modest upper critical fields [(μ0Hc2(0)=48±1 mT and μ0Hc2(0)=58±1 mT, respectively]. In WBe22, the temperature-dependent superfluid density suggests a fully gapped superconducting state, well-described by an s-wave model with a single energy gap. Heat-capacity data confirm that such a model applies to both compounds. Finally, ac magnetic susceptibility measurements under applied pressures up to 2.1 GPa reveal a linear suppression of the superconducting temperature, typical of conventional superconducting compounds.
UR - https://www.scopus.com/pages/publications/85134081462
U2 - 10.1103/PhysRevMaterials.6.064804
DO - 10.1103/PhysRevMaterials.6.064804
M3 - 文章
AN - SCOPUS:85134081462
SN - 2475-9953
VL - 6
JO - Physical Review Materials
JF - Physical Review Materials
IS - 6
M1 - 064804
ER -