Abstract
Previous crystallographic studies of Chevrel phases containing the ternary metals thallium or indium suggested that these metals were of ''mixed valence.'' Here, we conclusively show that the Tl s band lies at the Fermi level, since large Knight shifts (approx.2.4%) of the /sup 205/Tl NMR spectra in TlMo/sub 6/Se/sub 8/ are observed. This observation may help explain the high superconducting critical temperature of TlMo/sub 6/Se/sub 8/ (12.2 K) and the unique rhombohedral-to-rhombohedral structural phase transitions observed in InMo/sub 6/S/sub 8-x/Se/sub x/ compounds.
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