Electronic States and Magnetic Propertis of Edge-sharing Cu-O Chains

Yoshiaki Mizuno; Takami Tohyama; Sadamichi Maekawa; Tatsuaki Osafune; Naoki Motoyama; Hiroshi Eisaki; Shinichi Uchida

doi:10.1103/PhysRevB.57.5326

paper

Electronic States and Magnetic Propertis of Edge-sharing Cu-O Chains

arXiv:cond-mat/9708232 · doi:10.1103/PhysRevB.57.5326

Abstract

The electronic states and magnetic properties for the copper oxides containing edge-sharing Cu-O chains such as Li $_{2}$ CuO $_{2}$ , La $_{6}$ Ca $_{8}$ Cu $_{24}$ O $_{41}$ and CuGeO $_{3}$ are systematically studied. The optical conductivity $σ (ω)$ and the temperature dependence of the magnetic susceptibility $χ (T)$ for single crystalline samples Li $_{2}$ CuO $_{2}$ are measured as a reference system and analyzed by using the exact diagonalization method for small Cu-O clusters. It is shown that the spectral distribution of $σ (ω)$ is different between edge-sharing and corner-sharing Cu-O-Cu bonds. The charge transfer gap in edge-sharing chains is larger than that of high- $T_{c}$ cuprates. The exchange interaction between nearest-neighbor copper ions in edge-sharing chains $J_{1}$ depends sensitively on the Cu-O-Cu bond angles. In addition to $J_{1}$ , the exchange interaction between next-nearest-neighbor copper ions $J_{2}$ has sufficient contribution to the magnetic properties. We calculate $J_{1}$ and $J_{2}$ for all the copper oxides containing edge-sharing Cu-O chains and discuss the magnetic properties.

10 pages,RevTeX,8 postscript figures. Accepted for publication in Phys. Rev. B

Electronic States and Magnetic Propertis of Edge-sharing Cu-O Chains

Abstract

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