Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet
| dc.creator | Sachdev, Subir | |
| dc.creator | Ye, Jinwu | |
| dc.date | 1992-12-21 | |
| dc.date.accessioned | 2026-07-07T12:33:08Z | |
| dc.date.available | 2026-07-07T12:33:08Z | |
| dc.description | 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 $\barχ (ω) \sim \log(1/|ω|) + i (π/2) \mbox{sgn} (ω)$ at low frequencies. This form is identical to the phenomenological `marginal' spectrum proposed by Varma {\em et. al.\/} for the doped cuprates. | |
| dc.description | 13 pages, REVTEX, 2 figures available by request from subir@cmphys.eng.yale.edu | |
| dc.identifier | https://arxiv.org/abs/cond-mat/9212030 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/9212030 | |
| dc.identifier | Phys.Rev.Lett.70:3339,1993 | |
| dc.identifier | doi:10.1103/PhysRevLett.70.3339 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/217022 | |
| dc.subject | Condensed Matter | |
| dc.title | Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet | |
| dc.type | text |