Unusual states in the Heisenberg model with competing interactions
نویسنده
چکیده
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 thc bosonisation scheme. An instability leading to a spontaneous dimerisation is found. The new 'superfluid' phases with both non-zero, though non-nominal, Z-magnetisation and broken symmetry in the XY-plane are detected in the anisotropic case.
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تاریخ انتشار 2001