Mechanism of intrinsic dipole moment induction in quantum paraelectric SrTiO sub(3)

Mechanism of intrinsic dipole moment induction in quantum paraelectric SrTiO sub(3)

We measure the Ti K[beta] resonant X-ray emission spectra of SrTiO3 in the quantum paraelectric phase. We find that charge transfer (CT) excitation is affected by temperature decrease and UV irradiation, which provides direct evidence of the fact that the induced electric dipole moment is derived fr...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics Vol. 54; no. 10
Main Authors: Kawakami, Shuhei, Nakajima, Nobuo, Nakatake, Masashi, Kawamura, Naomi, Mizumaki, Masaichiro, Maruyama, Hiroshi
Format: Journal Article
Language:English
Published: 01-10-2015
Subjects:
Dipole moment
Displacement
Electric dipoles
Irradiation
Polar regions
Strontium titanates
Titanium
X-rays
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Summary:We measure the Ti K[beta] resonant X-ray emission spectra of SrTiO3 in the quantum paraelectric phase. We find that charge transfer (CT) excitation is affected by temperature decrease and UV irradiation, which provides direct evidence of the fact that the induced electric dipole moment is derived from the Ti off-center displacement. The UV-assisted dipole moments are aligned parallel to the applied DC electric field, as inferred from the additional change in the CT peak. We conclude that the local polar region formed by UV irradiation evolves under DC field application at low temperature.
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ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.10NC03