ELECTRONIC STATES OF VANADIUM SPINELS MGV2O4 AND ZNV2O4

Electronic states of the normal vanadium spinels MV(2)O(4) (M=Mg and Z n) and the Mg(V1-xAlx)(2)O-4 system have been studied through the meas urements of X-ray diffraction, electrical resistivity, magnetic suscep tibility and NMR of the V-51 and Al-27 nuclei. Apparently large Curie constants and Weiss temperatures in MV(2)O(4) have been found to be at tributed to the spin frustration on the characteristic network of V io ns. It has also been indicated that a substitution of V ions by nonmag netic Al ions leads to the phase similar to spin glass at low temperat ures, and stabilizes the short-range ordered spin clusters at high tem peratures.