High-pressure study of layered nitride superconductors
PhysRevB_70_104506.pdf 334 KB
Pressure dependence of critical temperature, lattice constant, and phonon frequency has been investigated for layered nitride superconductors, ZrNCl 0.7 and Li0.5(THF)HfNCl. The analysis of the data in terms of MacMillan's theory indicated that the relevant phonon frequencies are low (≈50 and 100 cm-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.
Physical Review B - Condensed Matter and Materials Physics
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