Model for Quasi-One-Dimensional Antiferromagnets: Application to CsNi
- 23 January 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 62 (4), 474-477
- https://doi.org/10.1103/physrevlett.62.474
Abstract
The approximate mapping of the antiferromagnetic Heisenberg chain onto a (1+1)-dimensional quantum field theory indicates that the ground state is disordered with a finite gap for integer spin. We study a lattice of coupled (1+1)-dimensional field theories as a model for weakly coupled spin chains. This model offers a possible resolution to the mystery of the upper mode in the low-temperature ordered phase of CsNi, whose polarization is inconsistent with spin-wave theory.
Keywords
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