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Localized-magnon states in strongly frustrated quantum spin lattices | | J. Richter
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10 Mar 2005 | | Journal: | Fizika Nizkikh Temperatur (Low Temperature Physics) {f 31}, 918 (2005) | | Subject: | Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech | | Abstract: | Recent developments concerning localized-magnon eigenstates in strongly frustrated spin lattices and their effect on the low-temperature physics of these systems in high magnetic fields are reviewed. After illustrating the construction and the properties of localized-magnon states we describe the plateau and the jump in the magnetization process caused by these states. Considering appropriate lattice deformations fitting to the localized magnons we discuss a spin-Peierls instability in high magnetic fields related to these states. Last but not least we consider the degeneracy of the localized-magnon eigenstates and the related thermodynamics in high magnetic fields. In particular, we discuss the low-temperature maximum in the isothermal entropy versus field curve and the resulting enhanced magnetocaloric effect, which allows efficient magnetic cooling from quite large temperatures down to very low ones. | | Source: | arXiv, cond-mat/0503243 | | Services: | Forum | Review | PDF | Favorites | |
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