Magnetic properties of Rb2Cu2Mo3O12 including a one-dimensional spin-1/2 Heisenberg system with ferromagnetic first-nearest-neighbor and antiferromagnetic second-nearest-neighbor exchange interactions -: art. no. 104426

被引:280
作者
Hase, M
Kuroe, H
Ozawa, K
Suzuki, O
Kitazawa, H
Kido, G
Sekine, T
机构
[1] NIMS, Tsukuba, Ibaraki 3050047, Japan
[2] Sophia Univ, Dept Phys, Chiyoda Ku, Tokyo 1028554, Japan
关键词
D O I
10.1103/PhysRevB.70.104426
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have investigated magnetic properties of Rb2Cu2Mo3O12 powder. Temperature dependence of magnetic susceptibility and magnetic-field dependence of magnetization have shown that this cuprate can be considered as a compound of a one-dimensional spin-1/2 Heisenberg system with ferromagnetic first-nearest-neighbor (1NN) and antiferromagnetic second-nearest-neighbor (2NN) competing interactions (competing system). Values of the 1NN and 2NN exchange interactions are estimated as J(1)=-138 K and J(2)=51 K (alphaequivalent toJ(2)/J(1)=-0.37). This value of alpha suggests that the ground state is a spin-singlet incommensurate state. In spite of relatively large J(1) and J(2), no magnetic phase transition appears down to 2 K, while an antiferromagnetic transition occurs in other model compounds of the competing system with ferromagnetic 1NN interaction. For that reason, Rb2Cu2Mo3O12 is a suitable compound to study properties of the incommensurate ground state that are unconfirmed experimentally.
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页码:104426 / 1
页数:6
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