Quantum and thermal fluctuations in the SU(N) Heisenberg spin-glass model near the quantum critical point
arXiv:cond-mat/0210407 · doi:10.1103/PhysRevLett.90.217202
Abstract
We solve for the SU(N) Heisenberg spin-glass in the limit of large N focusing on small S and T. We study the effect of quantum and thermal fluctuations in the frequency dependent response function and observed interesting transfers of spectral weight. We compute the T-dependence of the order parameter and the specific heat and find an unusual T^2 behavior for the latter at low temperatures in the spin-glass phase. We find a remarkable qualitative agreement with various experiments on the quantum frustrated magnet SrCr_{9p}Ga_{12-9p}O_{19}.
5 pages, 4 figures, submitted to Phys. Rev. Lett