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Upper limit for the anharmonicity of the cation modes in the superconducting Chevrel-phase compounds PbMo/sub 6/S/sub 8/ and SnMo/sub 6/S/sub 8/

Journal Article · · J. Low Temp. Phys.; (United States)
DOI:https://doi.org/10.1007/BF00682304· OSTI ID:5417770
PbMo/sub 6/S/sub 8/ and SnMo/sub 6/S/sub 8/ have low-lying phonon modes involving mainly motion of the Pb or Sn cation. It has long been believed that these cation modes are highly anharmonic. By examining the inelastic neutron scattering, x-ray diffraction, and magnetic susceptibility data in the literature, however, it is shown that these modes are nearly harmonic at room temperature. There is no evidence that they are anharmonic at low temperature. From the observed frequency of the cation modes at room temperature, the delocalization of the cation perpendicular to the trigonal axis calculated. The calculated delocalization agrees well with that indicated by the x-ray diffraction data.
Research Organization:
Univ. of Illinois, Urbana-Champaign (USA)
OSTI ID:
5417770
Journal Information:
J. Low Temp. Phys.; (United States), Journal Name: J. Low Temp. Phys.; (United States) Vol. 68:5/6; ISSN JLTPA
Country of Publication:
United States
Language:
English