Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-02-08
Ann. Phys. (Leipzig) 9, 133 (2000).
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 6 figures, full paper to accompany cond-mat/9804151
Scientific paper
10.1002/(SICI)1521-3889(200002)9
We present a theoretical analysis of the properties of low-dimensional quantum antiferromagnets in applied magnetic fields. In a nonlinear sigma model description, we use a spin stiffness analysis, a 1/N expansion, and a renormalization group approach to describe the broken-symmetry regimes of finite magnetization, and, in cases of most interest, a low-field regime where symmetry is restored by quantum fluctuations. We compute the magnetization, critical fields, spin correlation functions, and decay exponents accessible by nuclear magnetic resonance experiments. The model is relevant to many systems exhibiting Haldane physics, and provides good agreement with data for the two-chain spin ladder compound CuHpCl.
Kyriakidis Jordan
Loss Daniel
Normand Bruce
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