ACCIDENTAL NEAR DEGENERACY OF THE ORDER PARAMETER FOR SUPERCONDUCTING UPT3

被引：66

作者：

CHEN, DC ^{[1
]}

GARG, AP ^{[1
]}

机构：

[1] NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.70.1689

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

UPt3 appears to have a tetracritical point in the H-T plane for all orientations H of H. Such a point can exist only if the Ginzburg-Landau (GL) ''Hamiltonian'' has a conserved quantity Q. It is shown that the model of a two-component vector order parameter admits a Q for H parallel-to c, but has no tetracritical point. Hence, accidentally nearly degenerate order parameters are examined, particularly the model where one behaves as an A and the other as a B representation of D6h. This model can yield a tetracritical point for all H. Its physical properties are calculated and GL parameters are fitted to experiment.

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页码：1689 / 1692

页数：4

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