Two-dimensional randomly frustrated spin-1/2 Heisenberg model.
We investigate the properties of S = 1/2 Heisenberg clusters with random frustration using exact diagonalizations. This is a model for a quantum spin glass. We show that the average ground state spin is S proportional to the square root of N, where N is the number of sites. We also calculate the magnetic susceptibility and the spin stiffness and low-energy excitations and discuss these in terms of a semiclassical picture.
Oitmaa
J
J
School of Physics, University of New South Wales, Sydney 2052, Australia.
Sushkov
O P
OP