Phonon spectrum and soft-mode behavior of MgCNi3 -: art. no. 092511

被引：35
作者：
Heid, R
Renker, B
Schober, H
Adelmann, P
Ernst, D
Bohnen, KP
机构：
[1] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany
[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源：
PHYSICAL REVIEW B | 2004年 / 69卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.69.092511
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Temperature-dependent inelastic neutron-scattering measurements of the generalized phonon density-of-states for superconducting MgCNi3, 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. They suggest an incipient lattice instability of the stoichiometric compound with respect to Ni vibrations orthogonal to the Ni-C bond direction which is not directly linked to the superconducting state.
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