High-pressure study of layered nitride superconductors | Zendy

Y. Taguchi | Zendy; M. Hisakabe | Zendy; Yasuo Ohishi | Zendy; S. Yamanaka | Zendy; Yoshihiro Iwasa | Zendy

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High-pressure study of layered nitride superconductors

Author(s) -

Y. Taguchi,

M. Hisakabe,

Yasuo Ohishi,

S. Yamanaka,

Yoshihiro Iwasa

Publication year - 2004

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.70.104506

Subject(s) - superconductivity , phonon , condensed matter physics , physics , pairing , coupling constant , lattice (music) , lattice constant , nitride , excitation , lambda , materials science , quantum mechanics , nanotechnology , layer (electronics) , acoustics , diffraction

Pressure dependence of critical temperature, lattice constant, and phonon frequency has been investigated for layered nitride superconductors, ZrNCl0.7 and Li0.5sTHFdyHfNCl. 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 l 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.

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