Abstract
We summarize a set of recent experimental and theoretical work on the phenomenon of Bose-Einstein Condensation (BEC) of magnetic degrees of freedom in quantum magnets. We will focus on two examples: BaCuSi2O6, which contains planes of Cu S = 1/2 dimers, and NiCl2-4SC(NH2)2 (DTN), an organic magnet with Ni S = 1 weakly-coupled chains. In both compounds, the BEC corresponds to a field-induced antiferromagnetic ordered state that persists over a magnetic field range H c 1 to H c 2. At the quantum critical point at H c 1, the predicted power-law behavior of the critical fields and the magnetization for 3-D BEC is observed at low temperatures. In addition, BaCuSi2O6 shows a dimensional crossover from a 3-D BEC to 2-D behavior below 1 K.
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Zapf, V.S. (2008). A Review of Bose-Einstein Condensation in Certain Quantum Magnets Containing Cu and Ni. In: Barbara, B., Imry, Y., Sawatzky, G., Stamp, P.C.E. (eds) Quantum Magnetism. NATO Science for Peace and Security Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8512-3_15
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DOI: https://doi.org/10.1007/978-1-4020-8512-3_15
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