Phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic phases in the impurity-doped spin-peierls cuprate CuGeO3

被引：139

作者：

Masuda, T ^{[1
]}

Fujioka, A ^{[1
]}

Uchiyama, Y ^{[1
]}

Tsukada, I ^{[1
]}

Uchinokura, K ^{[1
]}

机构：

[1] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.80.4566

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic phases in impurity-doped spin-Peierls (SP) cuprate Cu1-xMgxGeO3. As Mg concentration increases, linear reduction of the SP transition temperature (T-SP) and linear increase of the Neel temperature (T-N) are observed for x up to x(c) similar or equal to 0.023. At x(c) the SP transition suddenly disappears and T-N jumps discontinuously. The peak of the susceptibility at x(c) around T-N is not as sharp as those at other concentrations, which indicates the separation of low and high concentration phases. These results indicate the existence of a first-order phase transition between dimerized-antiferromagnetic and uniform-antiferromagnetic long-range orders.

引用

页码：4566 / 4569

页数：4

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