Volume 101, Number 6, March 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 April 2013|
Peculiar magnetism of transition metal cluster compounds
1 ITM University - Sector 23 A, Gurgaon, Haryana, India
2 Tata Institute of Fundamental Research - Homi Bhabha Road, Mumbai-400005, India
3 School of Physical Sciences, Jawaharlal Nehru University - New Delhi-110067, India
Received: 17 January 2013
Accepted: 7 March 2013
We discuss a class of solids which have in their structure fairly separated tetrahederal clusters of transition metals: vanadium and molybednum. With decreasing temperature these compounds undergo a structural transition from cubic to rhombohederal phase at a temperature Ts, followed by a transition to a ferromagnetic phase at a lower temperarure Tc. Magnetic measurements indicate the presence of moments of spin half per cluster. Between Tc and Ts susceptibility shows large departures from Curie-Weiss behavior and specific heat has an unusually large non-phononic contribution. We present a model in which each cluster acts as a unit associated with a magnetic moment of spin half and a structural degree of freedom related to distortions of the tetrahedron. Our model accounts for all the observed features including effects due to external pressure and magnetic field.
PACS: 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.25.Dk – Orbital, charge, and other orders, including coupling of these orders / 75.80.+q – Magnetomechanical effects, magnetostriction
© EPLA, 2013
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