Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet
arXiv:cond-mat/9212030 · doi:10.1103/PhysRevLett.70.3339
Abstract
We examine the spin-$S$ quantum Heisenberg magnet with Gaussian-random, infinite-range exchange interactions. The quantum-disordered phase is accessed by generalizing to $SU(M)$ symmetry and studying the large $M$ limit. For large $S$ the ground state is a spin-glass, while quantum fluctuations produce a spin-fluid state for small $S$. The spin-fluid phase is found to be generically gapless - the average, zero temperature, local dynamic spin-susceptibility obeys $\barÏ (Ï) \sim \log(1/|Ï|) + i (Ï/2) \mbox{sgn} (Ï)$ at low frequencies. This form is identical to the phenomenological `marginal' spectrum proposed by Varma {\em et. al.\/} for the doped cuprates.
13 pages, REVTEX, 2 figures available by request from subir@cmphys.eng.yale.edu