Superconductivity in Nb4MSi (M=Ni, Co, and Fe) with a quasi-two-dimensional Nb network
Gihun Ryu, Sung Wng Kim, Satoru Matsuishi, Hitoshi Kawaji, Hideo Hosono
DOI 10.1103/PhysRevB.84.224518 · Physical Review B
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Abstract
The CuAl2-type Nb4MSi (M = Ni, Co, and Fe) compound is composed of a quasi-two-dimensional Nb network. We found that Nb4NiSi with a space group of P4/mcc is a bulk type-II superconductor (lower critical field value of 10.7 mT and upper critical field value of 1.89 T), with the highest critical temperature (Tc of 7.7 K) among these compounds. The electron–phonon coupling constant of ∼0.6 and Debye temperature of 415 K are estimated from the results of heat capacity measurements, and the density functional theory calculation indicates that the electronic density of states around the Fermi level is primarily composed of Nb 4d orbitals. We report the relationship between Tc and Debye temperature in the low-dimensional Nb-based system and attribute the relatively high Tc in Nb4NiSi to the higher Debye temperature originating from the shortest Nb–Nb distance in the Nb network.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb4NiSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.7 | Pressure not reported | onset |
| Nb4NiSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.7 | Pressure not reported | onset |
| Nb4NiSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | midpoint |
| Nb4CoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| Nb4FeSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.8 | Pressure not reported | unknown |
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