Metal insulator phase transition and magnetic properties of V(n < /inf > O(2n-1 < /inf >

• Published in: IEEE transactions on magnetics Vol. 8; no. 3; pp. 581 - 583
• Main Authors: Okinaka, H, Kachi, S
• Format: Journal Article
• Language: English
• Published: 01.09.1972
• ISSN: 0018-9464

Magnetic properties of V(n < /inf > O(2n-1 < /inf > system, which shows the temperature induced metal insulator phase transition at T(t < /inf > , were studied by the measurement of magnetic susceptibility and Mossbauer effect. It was observed that V(3 < /inf > O(5 < /inf > , V(4 < /inf > O(7 < /inf > , V(5 < /inf > O(9 < /inf > , V(6 < /inf > O(11 < /inf > , V(7 < /inf > O(13 < /inf > , and V(8 < /inf > O(15 < /inf > order anti-ferromagnetically at 70, 40, 30, 23, 51, and 7 K, respectively. V(3 < /inf > O(5 < /inf > behaves like a low dimensional antiferromagnet. V(7 < /inf > O(13 < /inf > is a metallic antiferromagnet. Above T(t < /inf > (metallic phase) the total susceptibility chi(mol < /inf > can be represented by chi(mol < /inf > = C(obs < /inf > / T-theta chi(0 < /inf > . C(obs < /inf > is in a good agreement with calculated value C(cal < /inf > , assuming that the material is ionic (V( 3)and V( 4)in a paramagnetic state). Density of electronic state of Fermi levelDUL{(epsilonUL{f})UL{x}UL{0}was calculated from chi(0 < /inf > assuming Pauli paramagnetism and compared with theDUL{(epsilonUL{f})ULgammaobtained by specific heat measurement.