Finite-temperature properties of quantum antiferromagnets in a uniform magnetic field in one and two dimensions
- 1 July 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 50 (1) , 258-272
- https://doi.org/10.1103/physrevb.50.258
Abstract
Consider a d-dimensional antiferromagnet with a quantum disordered ground state and a gap to bosonic excitations with nonzero spin. In a finite external magnetic field, this antiferromagnet will undergo a phase transition to a ground state with nonzero magnetization, describable as the condensation of a dilute gas of bosons. The finite-temperature properties of the Bose gas in the vicinity of this transition are argued to obey a hypothesis of zero scale-factor universality for dd=2. Scaling properties of various experimental observables are computed in an expansion in ε=2-d, and exactly in d=1.Keywords
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