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

doi:10.7566/JPSJ.85.094702

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

IMR - Institute for Materials Research (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We studied the Co valences and spin states in electron-doped LaCo_1-yTe_yO₃ 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 j_eff = 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 language	English
Article number	094702
Journal	Journal of the Physical Society of Japan
Volume	85
Issue number	9
DOIs	https://doi.org/10.7566/JPSJ.85.094702
Publication status	Published - 2016 Sept 15

Access to Document

10.7566/JPSJ.85.094702

Cite this

Tomiyasu, K., Koyama, S. I., Watahiki, M., Sato, M., Nishihara, K., Takahashi, Y., Onodera, M., Iwasa, K., Nojima, T., Nojiri, H., Okamoto, J., Huang, D. J., Yamasaki, Y., Nakao, H., & Murakami, Y. (2016). Microscopic examinations of Co valences and spin states in electron-doped LaCoO₃ Journal of the Physical Society of Japan, 85(9), Article 094702. https://doi.org/10.7566/JPSJ.85.094702

@article{64ad8700ec244885ada0748520722158,

title = "Microscopic examinations of Co valences and spin states in electron-doped LaCoO3 ",

abstract = "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.",

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

note = "Funding Information: We thank Mr. S. Kayamori for assisting with the sample characterization, Mr. S. Nara and Ms. E. P. Sinaga for assisting with the preliminary sample evaluation, Mr. K. Hashimoto for assisting with the preliminary ESR data analysis, Dr. N. Kimura for assisting with the SQUID measurements, and the NSRRC staff and students for their hospitality and assistance with the XAS measurements. The PF experiments were performed under the approval of the Photon Factory Program Advisory Committee (Proposal Nos. 2009S2-008, 2012S2-005, and 2015PF-BL-19B). This study was financially supported by Grants-in-Aid for Young Scientists (B) (22740209 and 26800174), Scientific Research (B) (15H03692), and Scientific Research (S) (21224008) from MEXT, Japan. H.N. and Y.M. were financially supported by the Funding Program for World-Leading Innovative RandD in Science and Technology (FIRST). Publisher Copyright: {\textcopyright}2016 The Physical Society of Japan.",

year = "2016",

month = sep,

day = "15",

doi = "10.7566/JPSJ.85.094702",

language = "English",

volume = "85",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "The Physical Society of Japan",

number = "9",

}

Tomiyasu, K, Koyama, SI, Watahiki, M, Sato, M, Nishihara, K, Takahashi, Y, Onodera, M, Iwasa, K, Nojima, T , Nojiri, H, Okamoto, J, Huang, DJ, Yamasaki, Y, Nakao, H & Murakami, Y 2016, 'Microscopic examinations of Co valences and spin states in electron-doped LaCoO₃ ', Journal of the Physical Society of Japan, vol. 85, no. 9, 094702. https://doi.org/10.7566/JPSJ.85.094702

TY - JOUR

T1 - Microscopic examinations of Co valences and spin states in electron-doped LaCoO3

AU - Tomiyasu, Keisuke

AU - Koyama, Syun Ichi

AU - Watahiki, Masanori

AU - Sato, Mika

AU - Nishihara, Kazuki

AU - Takahashi, Yuki

AU - Onodera, Mitsugi

AU - Iwasa, Kazuaki

AU - Nojima, Tsutomu

AU - Nojiri, Hiroyuki

AU - Okamoto, Jun

AU - Huang, Di Jing

AU - Yamasaki, Yuuichi

AU - Nakao, Hironori

AU - Murakami, Youichi

N1 - Funding Information: We thank Mr. S. Kayamori for assisting with the sample characterization, Mr. S. Nara and Ms. E. P. Sinaga for assisting with the preliminary sample evaluation, Mr. K. Hashimoto for assisting with the preliminary ESR data analysis, Dr. N. Kimura for assisting with the SQUID measurements, and the NSRRC staff and students for their hospitality and assistance with the XAS measurements. The PF experiments were performed under the approval of the Photon Factory Program Advisory Committee (Proposal Nos. 2009S2-008, 2012S2-005, and 2015PF-BL-19B). This study was financially supported by Grants-in-Aid for Young Scientists (B) (22740209 and 26800174), Scientific Research (B) (15H03692), and Scientific Research (S) (21224008) from MEXT, Japan. H.N. and Y.M. were financially supported by the Funding Program for World-Leading Innovative RandD in Science and Technology (FIRST). Publisher Copyright: ©2016 The Physical Society of Japan.

PY - 2016/9/15

Y1 - 2016/9/15

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84984914668&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84984914668&partnerID=8YFLogxK

U2 - 10.7566/JPSJ.85.094702

DO - 10.7566/JPSJ.85.094702

M3 - Article

AN - SCOPUS:84984914668

SN - 0031-9015

VL - 85

JO - Journal of the Physical Society of Japan

JF - Journal of the Physical Society of Japan

IS - 9

M1 - 094702

ER -

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

Abstract

Access to Document

Other files and links

Fingerprint

Cite this