Microscopic examinations of Co valences and spin states in electron-doped LaCoO3

Keisuke Tomiyasu, Syun Ichi Koyama, Masanori Watahiki, Mika Sato, Kazuki Nishihara, Yuki Takahashi, Mitsugi Onodera, Kazuaki Iwasa, Tsutomu Nojima, Hiroyuki Nojiri, Jun Okamoto, Di Jing Huang, Yuuichi Yamasaki, Hironori Nakao, Youichi Murakami

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5 Citations (Scopus)


We studied the Co valences and spin states in electron-doped LaCo1-yTeyO3 by measuring X-ray absorption spectra and electron spin resonance. The low-temperature insulating state involves the low-spin Co3+ state (S = 0) and the high-spin Co2+ state, where the latter is described by g = 3.8 and jeff = 1/2. The results, in concurrence with the electron-hole asymmetry confirmed in the electrical resistivity, coincide with the spin-blockade phenomenon in this system. Furthermore, we discuss the g factor in terms of the strong covalent-bonding nature and consider multiple origins of this phenomenon.

Original languageEnglish
Article number094702
JournalJournal of the Physical Society of Japan
Issue number9
Publication statusPublished - 2016 Sept 15


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