Phonon spectrum and soft-mode behavior of MgCNi_3

Details Phonon spectrum and soft-mode behavior of MgCNi_3 Phonon spectrum and soft-mode behavior of MgCNi_3

2003-10-24

arxiv.org/abs/cond-mat/0310592v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.69.092511

Temperature dependent inelastic neutron-scattering measurements of the generalized phonon density-of-states for superconducting MgCNi_3, T_c=8 K, give evidence for a soft-mode behavior of low-frequency Ni phonon modes. Results are compared with ab initio density functional calculations which suggest an incipient lattice instability of the stoichiometric compound with respect to Ni vibrations orthogonal to the Ni-C bond direction.

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