Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-03-13
Physics
Condensed Matter
Strongly Correlated Electrons
15 pages, 35 figures
Scientific paper
10.1143/JPSJ.73.1798
The selection of the ground state among nearly degenerate states due to quantum fluctuations is studied for the S=1/2 XY-like Heisenberg antiferromagnets on the triangular lattice in the magnetic field applied along the hard axis, which was first pointed out by Nikuni and Shiba. We find that the selected ground state sensitively depends on the degree of the anisotropy and the magnitude of the magnetic field. This dependence is similar to that in the corresponding classical model at finite temperatures where various types of field induced phases appear due to the entropy effect. It is also found that the similarity of the selected states in the classical and quantum models are not the case in a two-leg ladder lattice, although the lattice consists of triangles locally and the ground state of this lattice in the classical case is the same as that of the triangular lattice.
Miyashita Seiji
Okunishi Kouichi
Senda Makoto
Yoshikawa Shin-ichiro
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