Received 7 April 1972, Revised 17 August 1972, Available online 28 July 2006.
Abstract
Measurements of the magnetic susceptibility in the temperature range 4–1000°K are reported for the vanadium sulfides VS, V3S4-V2S3 and V5S8. At higher temperatures the susceptibility of all compounds approaches a constant, positive value, indicating a Pauli-paramagnetic contribution of itinerant electrons. At lower temperatures an increase of the susceptibility is observed. This effect is particularly pronounced in V5S8, and is taken as evidence for the presence of localized magnetic moments.
Nuclear magnetic resonance spectra of V5S8 show two lines, one with a temperature-independent Knight shift, and one with a positive Knight shift which increases strongly at lower temperatures. The two lines are attributed to vanadium atoms with itinerant delectrons, and to vanadium atoms with localized d electrons, respectively. This interpretation is consistent with the magnetic susceptibility data. The difference in properties between two types of vanadium atoms in V5S8 can be understood by considering the crystal structure.
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