Magnetic properties of electron-doped LaCoO3

Keisuke Tomiyasu, Mika Sato, Shun Ichi Koyama, Tsutomu Nojima, Ryoichi Kajimoto, Sungdae Ji, Kazuaki Iwasa

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2 Citations (Scopus)

Abstract

We studied electron-doped LaCo1-yTe6+yO3 by magnetization measurements and neutron scattering. The effective Bohr magneton, estimated by Curie–Weiss fitting around room temperature, is independent of y. This suggests that magnetic Co3+(HS), not nonmagnetic Co3+(LS), is mainly replaced by doped magnetic Co2+(HS). At the lowest temperatures, a Brillouin-function-like saturating behavior persists in the magnetization curves even in the high-y samples, and neither a clear magnetic reflection nor magnetic dispersion is observed by neutron scattering. These findings indicate that the magnetic correlation is very weak, in contrast to the well-known hole-doped LaCoO3 accompanied by a drastic transition to a ferromagnetic metal. However, we also found that the low-y samples exhibit nonnegligible enhancement of the saturated magnetization by ~2μB per a doped electron. All these characteristics are discussed in the light of the activation and inactivation of a spin-state blockade.

Original languageEnglish
Article number094706
Journaljournal of the physical society of japan
Volume86
Issue number9
DOIs
Publication statusPublished - 2017 Sep 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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