| Autor: |
Balestra, Manuele D., Atanov, Omargeldi, Lefεave;vre, Robin, Blacque, Olivier, Ng, Yat Hei, Lortz, Rolf, von Rohr, Fabian O. |
| Zdroj: |
Journal of Materials Chemistry C; 8/28/2022, Vol. 10 Issue 32, p11703-11709, 7p |
| Abstrakt: |
We report on the discovery, structural analysis, and the physical properties of Nb4SiSb2 – a hitherto unknown compound crystallizing in the V4SiSb2-type structure with the tetragonal space group I4/mcm and unit cell parameters a = 10.3638(2) Å and c = 4.9151(2) Å. We find Nb4SiSb2 to be a metal undergoing a transition to a superconducting state at a critical temperature of Tc ≈ 1.6 K. The bulk nature of the superconductivity in this material is confirmed by the observation of a well defined discontinuity in specific heat with a normalized specific heat jump of ΔC(Tc)/γTc = 1.33 mJ mol−1 K−2. We find that for Nb4SiSb2, the unoccupied sites on the 4b Wyckoff position can be partially occupied with Cu, Pd, or Pt. Low-temperature resistivity measurements show transitions to superconductivity for all three compounds at Tc ≈ 1.2 K for Nb4Cu0.2SiSb2, and Tc ≈ 0.8 K for Nb4Pd0.2SiSb2 as well as for Nb4Pt0.14SiSb2. The addition of electron-donor atoms into these void positions, henceforth, lowers the superconducting transition temperature in comparison to the parent compound. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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