Quasi-two-dimensional hole ordering and dimerized state in the CuO2-chain layers in Sr14CU24O41

被引：65

作者：

Matsuda, M ^{[1
]}

Yosihama, T

Kakurai, K

Shirane, G

机构：

[1] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[2] Univ Tokyo, ISSP, Neutron Scattering Lab, Tokai, Ibaraki 3191106, Japan

[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.59.1060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Neutron-scattering experiments have been performed on Sr14Cu24O41 that consists of both chains and ladders of copper ions. We observed that the magnetic excitations from the CuO2 chain have two branches and that both branches are weakly dispersive along the a and c axes. The omega-Q dispersion relation as well as the intensities can be reasonably described by a random-phase approximation with intradimer coupling J = 11 meV, interdimer coupling along the c axis J(c)=0.75 meV, and interdimer coupling along the a axis J(a)=0.75 meV. The dimer configuration indicates a quasi-two-dimensional hole ordering, resulting in an ordering of magnetic Cu2+ With spin-1/2 and nonmagnetic Cu, which forms the Zhang-Rice singlet. We have also studied the effect of Ca substitution for Sr on the dimer and the hole ordering. [S0163-1829(99)11401-2].

引用

页码：1060 / 1067

页数：8

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