Superconductivity in Chevrel phases

5 Discrete and Condensed Transition Metal Clusters in Solids 

In MoeSgPb, the electrons occupy the local minimum at F whose position is very sensitive to any (static or dynamic) cluster deformation and to changes in the intercluster contacts. Hence, strong electron-phonon interaction involving quasi molecular electronic levels of the clusters at the Fermi level indicate a source for the pairwise attractive interactions between the conduction electrons. 

3 Magnetic Order/Disorder in Category (ii) Lanthanoid Hydride Halides 

In the reduced binary and ternary halides of the lanthanoids, the f electrons are well localized on the metal atoms. The coupling between the magnetic moments is weak in the case of insulators as can be seen from the low ordering temperatures of the saltlike trihalides whereby, for example, GdQj orders ferromagneti-cally at 2.2K. In the presence of extended M-M bonding, the conduction electrons provide a very efficient mechanism for coupling the moments via a RKKY 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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