Magnetic properties of electron-doped LaCoO

富安 啓輔*; 佐藤 美嘉*; 小山 俊一*; 野島 勉*; 梶本 亮一; Ji, S.*; 岩佐 和晃*

Journal of the Physical Society of Japan, 86(9), p.094706_1 - 094706_6, 2017/09

https://doi.org/10.7566/JPSJ.86.094706

We studied electron-doped LaCoTeO by magnetization measurements and neutron scattering. The effective Bohr magneton, estimated in the Curie-Weiss fitting around room temperature, is independent of . This suggests that magnetic Co, not nonmagnetic Co, is mainly replaced by doped magnetic Co. At the lowest temperatures, a Brillouin-function-like saturating behavior persists in the magnetization curves even in the high- samples, and neither clear magnetic reflection nor magnetic dispersion is observed by neutron scattering. These indicate that magnetic correlation is very weak in contrast to the well-known hole-doped LaCoO accompanied with the transition to ferromagnetic metal. However, we also found that the low- samples exhibit nonnegligible enhancement in saturated magnetization by 2 /doped-electron. All these characteristics are discussed in the light of activation and inactivation of spin-state blockade.