Superconductivity in noncentrosymmetric ternary equiatomic pnictides LaMP (M = Ir and Rh; P = P and As)
Yanpeng Qi, Jiangang Guo, Hechang Lei, Zewen Xiao, Toshio Kamiya, Hideo Hosono
DOI 10.1103/PhysRevB.89.024517 · Physical Review B
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Abstract
We report bulk superconductivity of ternary equiatomic pnictides LaMP (M = Ir and Rh; P = P and As) along with the crystal structure and physical properties (resistivity, magnetization, and heat capacity). It crystallized in a noncentrosymmetric structure type (space group I41md, Z = 4), which is an ordered ternary derivative of the centrosymmetric α-ThSi2 structure. Three ternary pnictides showed superconductivity at low temperatures, and the highest critical temperature, Tc = 5.3 K, was observed for LaIrP. The experimental and density functional calculations results suggested that LaMP could be categorized as a Bardeen–Cooper–Schrieffer superconductor with intermediate coupling. Considering the similar Sommerfeld value and Debye temperature, the differences in Tc were attributed to the difference in the electron-phonon coupling strength in the compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaIrP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.3 | Pressure unresolved | onset |
| LaIrAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.1 | Pressure unresolved | onset |
| LaRhP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.5 | Pressure unresolved | onset |
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