期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL
卷 35, 期 31, 页码 6545-6555出版社
IOP PUBLISHING LTD
DOI: 10.1088/0305-4470/35/31/302
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Recently obtained results on linear energy bounds are generalized to arbitrary spin quantum numbers and coupling schemes. Thereby, the class of so-called independent magnon states, for which the relative ground-state property can be rigorously established, is considerably enlarged. We still require that the matrix of exchange parameters has constant row sums, but this can be achieved by means of a suitable gauge and need not be considered as a physical restriction.
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