Tricritical behavior in itinerant quantum ferromagnets -: art. no. 247205

被引:144
作者
Belitz, D [1 ]
Kirkpatrick, TR
Rollbühler, J
机构
[1] Univ Oregon, Dept Phys, Eugene, OR 97403 USA
[2] Univ Oregon, Inst Mat Sci, Eugene, OR 97403 USA
[3] Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 USA
[4] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
关键词
D O I
10.1103/PhysRevLett.94.247205
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
It is shown that the peculiar features observed in the low-temperature phase diagrams of ZrZn2, UGe2, and MnSi can be understood in terms of a simple mean-field theory. The nature of the ferromagnetic transition changes from second order to first order at a tricritical point, and in a small external magnetic field surfaces of first-order transitions emerge which terminate in quantum critical points. This field dependence of the phase diagram follows directly from the existence of the tricritical point. The quantum critical behavior in a nonzero field is calculated exactly.
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页数:4
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