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Title: Pulse-based electron spin transient nutation measurement of BaTiO₃ fine particle: Identification of controversial signal around g = 2.00
Authors: Sawai, Takatoshi
Yamaguchi, Yoji
Kitamura, Noriko
Date, Tomotsugu
Konishi, Shinya
Taga, Kazuya
Tanaka, Katsuhisa  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-1409-2802 (unconfirmed)
Author's alias: 小西, 伸弥
多賀, 和哉
田中, 勝久
Issue Date: 14-May-2018
Publisher: AIP Publishing
Journal title: Applied Physics Letters
Volume: 112
Issue: 20
Thesis number: 202902
Abstract: Two dimensional pulse-based electron spin transient nutation (2D-ESTN) spectroscopy is a powerful tool for determining the spin quantum number and has been applied to BaTiO₃ fine powder in order to identify the origin of the continuous wave electron spin resonance (CW-ESR) signal around g = 2.00. The signal is frequently observed in BaTiO3 ceramics, and the correlation between the signal intensity and positive temperature coefficient of resistivity (PTCR) properties has been reported to date. The CW-ESR spectrum of BaTiO3 fine particles synthesized by the sol-gel method shows a typical asymmetric signal at g = 2.004. The 2D-ESTN measurements of the sample clearly reveal that the signal belongs to the S = 5/2 high spin state, indicating that the signal is not due to a point defect as suggested by a number of researchers but rather to a transition metal ion. Our elemental analysis, as well as previous studies, indicates that the origin of the g = 2.004 signal is due to the presence of an Fe3+impurity. The D value (second-order fine structure parameter) reveals that the origin of the signal is an Fe3+ center with distant charge compensation. In addition, we show a peculiar temperature dependence of the CW-ESR spectrum, suggesting that the phase transition behavior of a BaTiO3 fine particle is quite different from that of a bulk single crystal. Our identification does not contradict a vacancy-mediated mechanism for PTCR. However, it is incorrect to use the signal at g = 2.00 as evidence to support the vacancy-mediated mechanism.
Rights: The following article appeared in 'Appl. Phys. Lett. 112, 202902 (2018)' and may be found at https://aip.scitation.org/doi/10.1063/1.5020675.
The full-text file will be made open to the public on 14 May 2019 in accordance with publisher's 'Terms and Conditions for Self-Archiving'
URI: http://hdl.handle.net/2433/235323
DOI(Published Version): 10.1063/1.5020675
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