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Abstract: This short review surveys phenomena observed when a magnetic field is appliedto a system of localised spins on a lattice. Its focus is on frustrated magnetsin dimension $d \geq 2$. The interplay of field and entropy is illustrated inthe context of their unusual magnetocaloric properties, where field-tuneddegeneracies assert themselves. Magnetisation plateaux can reveal the physicsof fluctuations, with unusual excitations such as local modes, extended stringdefects or monopoles involved in plateau termination. Field-tuning latticegeometry is the final topic, where mechanisms for dimensional reduction andconversion between different lattice types are discussed.



Autor: R. Moessner

Fuente: https://arxiv.org/







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