High-pressure study of layered nitride superconductors
Y. Taguchi, M. Hisakabe, Y. Ohishi, S. Yamanaka, Y. Iwasa
DOI 10.1103/PhysRevB.70.104506 · Physical Review B
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Abstract
Pressure dependence of critical temperature, lattice constant, and phonon frequency has been investigated for layered nitride superconductors, ZrNCl0.7 and Li0.5(THF)yHfNCl. The analysis of the data in terms of MacMillan’s theory indicated that the relevant phonon frequencies are low (≈50 and 100cm−1, respectively), and that the electron-phonon coupling constant λ is larger than 3 in both compounds in sharp contrast with previous experimental and theoretical results. This result may suggest a possibility that other bosonic excitation than phonon additionally contributes to the pairing interaction in these materials.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ZrNCl0.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure unresolved | onset |
| ZrNCl0.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | 1.7 GPa | onset |
| Li0.5(THF)yHfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.5 | Pressure unresolved | midpoint |
| Na0.3HfNCl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.4 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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