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Lecture Seiji Miyashita


27 April 2004 FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen
Speaker:Prof. Seiji Miyashita
Affiliation:Department of Applied Physics, The University of Tokyo, Japan
Title:Phase transistions induced by thermal and quantum fluctuation
Date:Tue Apr 27, 2004
Location:FWN-Building 5114.0004
Host:H.A. De Raedt
Telephone:+31 50 363 4852


Selection of stable phases among nearly degenerate states by classical and quantum fluctuation is studied for the XY-like Heisenberg antiferromagnets on the triangular lattice in the magnetic field applied along the hard axis. In the classical ground state, the magnetization is a straight line until saturation. We study phase transitions in the magnetization process in the ground state for quantum case, while we study the magnetization process at finite temperature in the classical case. We find that the phases thus selected depend strongly on the degree of the anisotropy and the value of the magnetic field. The dependence is similar in both cases of classical and quantum cases. We also study the effect of geometrical shape of the lattice on the magnetization process.
Last modified:22 October 2012 2.30 p.m.