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Random Exchange Quantum Heisenberg Chains | | A. Furusaki
; M. Sigrist
; E. Westerberg
; P.A. Lee
; K.B. Tanaka
; N. Nagaosa
; | | Date: |
20 Jul 1995 | | Subject: | cond-mat | | Abstract: | The one-dimensional quantum Heisenberg model with random $pm J$ bonds is studied for $S=frac{1}{2}$ and $S=1$. The specific heat and the zero-field susceptibility are calculated by using high-temperature series expansions and quantum transfer matrix method. The susceptibility shows a Curie-like temperature dependence at low temperatures as well as at high temperatures. The numerical results for the specific heat suggest that there are anomalously many low-lying excitations. The qualitative nature of these excitations is discussed based on the exact diagonalization of finite size systems. | | Source: | arXiv, cond-mat/9507083 | | Services: | Forum | Review | PDF | Favorites | |
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