Field induced order in magnetic systems: Marginal case |
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Authors: | D Reyes MA Continentino |
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Institution: | a Centro Brasileiro de Pesquisas Físicas - Rua Dr. Xavier Sigaud, 150-Urca, 22290-180 RJ, Brazil b Instituto de Física, Universidade Federal Fluminense, Campus da Praia Vermelha, Niterói, RJ 24.210-340, Brazil |
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Abstract: | The bond operator representation and the one-loop renormalization group treatment are used to study the spin-1 Heisenberg antiferromagnetic with single-ion anisotropy and transversal magnetic fields in three-dimensional cubic lattices. We start from a disordered spin-liquid phase to an ordered phase, at a critical field Hc1 above which the system enters an XY-antiferromagnetic phase. This transition is interpreted as belonging to a universality class with a dynamical critical exponent z=1. In this marginal case logarithmic corrections are found to the physical quantities. These theoretical predictions are compared with the scaling of the magnetization as a function of field and temperature for the organic compound NiCl2-4SC(NH2)2. |
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Keywords: | Bose-Einstein condensation Quantized spin model |
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