Unusual states in the Heisenberg model with competing interactions

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A phase diagram of the anisotropic Heisenberg model with competition between the nearest and the next-to-nearest neighbour exchange interactions is investigated by using the bosonisation scheme. An instability leading to a spontaneous dimerisation is found. The new 'superfluid' phases with both nonzero, though nonnominal, Z-magnetisation and broken symmetry in the XY-plane are detected in the anisotropic case.

Original languageEnglish (US)
Article number012
Pages (from-to)4455-4470
Number of pages16
JournalJournal of Physics: Condensed Matter
Issue number19
StatePublished - Dec 1 1990


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