Magnetic field induced ordering in quasi-one-dimensional quantum magnets |
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Authors: | S Wessel S Haas |
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Institution: | (1) Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, USA, US |
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Abstract: | Three-dimensional magnetic ordering transitions are studied theoretically in strongly anisotropic quantum magnets. An external
magnetic field can drive quasi-one-dimensional subsystems with a spin gap into a gapless regime, thus inducing long-range
three-dimensional magnetic ordering due to weak residual magnetic coupling between the subsystems. Compounds with higher spin
degrees of freedom, such as N-leg spin-1/2 ladders, are shown to have cascades of ordering transitions. At high magnetic fields, zero-point fluctuations
within the quasi-1D subsystems are suppressed, causing quantum corrections to the ordering temperature to be reduced.
Received 24 March 2000 |
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Keywords: | PACS 75 10 Jm Quantized spin models - 75 30 -m Intrinsic properties of magnetically ordered materials - 75 50 Ee Antiferromagnetics |
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