Quantum and thermal fluctuations in the SU(N) Heisenberg spin-glass model near the quantum critical point

Details Quantum and thermal fluctuations in the SU(N) Heisenberg spin-glass model near the quantum critical point Quantum and thermal fluctuations in the SU(N) Heisenberg spin-glass model near the quantum critical point

2002-10-18

arxiv.org/abs/cond-mat/0210407v1

Phys. Rev. Lett. 90, 217202 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.90.217202

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}.

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