Electron-phonon coupling and nontrivial band topology in noncentrosymmetric superconductors LaNiSi, LaPtSi, and LaPtGe
Peiran Zhang, Huiqiu Yuan, Chao Cao
DOI 10.1103/PhysRevB.101.245145 · Physical Review B
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Abstract
The electronic structure and phonon properties of LaNiSi, LaPtSi, and LaPtGe have been studied using the first-principles density functional calculations. The electronic density of states near Fermi level of these compounds are dominated by the transition metal d orbitals and Si/Ge p orbitals, forming six sheets of Fermi surfaces. The asymmetric spin-orbit coupling lifts the spin degeneracies and creates four topological Weyl nodal rings around X points, protected by the nonsymmorphic symmetry and time-reversal symmetry. The bare-electron susceptibility does not show a prominent feature, and electron-phonon coupling is sufficient to explain the observed superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaNiSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure not reported | unknown |
| LaPtSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.7 | Pressure not reported | unknown |
| LaPtGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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