Short-time dynamics study of Heisenberg noncollinear magnets

Mirsaeed Zelli; K. Boese; B. W. Southern

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Short-time dynamics study of Heisenberg noncollinear magnets

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A generalized model which describes a family of antiferromagnetic Heisenberg magnets on a three-dimensional stacked triangular lattice is studied. The model contains a constraint parameter which changes the details of the interactions but not the symmetry of the model. We investigate the question of whether a first or second order phase transition occurs in these systems using a short time dynamics method. The effective critical exponents are determined as a function of the constraint parameter. Our results provide strong evidence that the phase transition is first order. In addition, for a particular value of the constraint parameter, the model corresponds to a stacked kagome lattice. In this case, our results also indicate the existence of a finite temperature first order phase transition.

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《Physical review, B. Condensed matter and materials physics》 |2007年第22期|224407.1-224407.5|共9页
作者
Mirsaeed Zelli; K. Boese; B. W. Southern;
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作者单位

Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;

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正文语种英语
中图分类固体物理学;
关键词
classical spin models; static properties (order parameter; static susceptibility; heat capacities; critical exponents; etc.); numerical simulation studies;

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Short-time dynamics study of Heisenberg noncollinear magnets

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