Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies

Xingquan Zou; Mi He; Daniel Springer; Dongwook Lee; Saritha K. Naiz; Siew Ann Cheong; Tao Wu; C. Panagopoulos; D. Talbayev; Elbert E.M. Chia

doi:10.1063/1.3679725

Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies

Xingquan Zou, Mi He, Daniel Springer, Dongwook Lee, Saritha K. Naiz, Siew Ann Cheong, Tao Wu, C. Panagopoulos, D. Talbayev, Elbert E.M. Chia^*

^*Corresponding author for this work

Physical Science and Engineering

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

5 Scopus citations

Abstract

We present THz conductivity of LaAlO3 (LAO) as a function of temperature and annealing, using terahertz time-domain spectroscopy (THz-TDS). We observed that, after annealing, spectral weight redistribution occurs, such that the real conductivity ?1(ω) changed from a featureless and almost frequency-independent spectrum, into one where peaks occur near the phonon frequencies. These phonon frequencies increase with increasing temperature.We attribute the appearance of these absorption peaks to the diffusion and relocation of oxygen vacancies. The dielectric functions of annealed LAO are well fitted with the Drude-Lorentz model.

Original language	English (US)
Article number	038
Journal	AIP Advances
Volume	2
Issue number	1
DOIs	https://doi.org/10.1063/1.3679725
State	Published - Dec 1 2012

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies",

abstract = "We present THz conductivity of LaAlO3 (LAO) as a function of temperature and annealing, using terahertz time-domain spectroscopy (THz-TDS). We observed that, after annealing, spectral weight redistribution occurs, such that the real conductivity ?1(ω) changed from a featureless and almost frequency-independent spectrum, into one where peaks occur near the phonon frequencies. These phonon frequencies increase with increasing temperature.We attribute the appearance of these absorption peaks to the diffusion and relocation of oxygen vacancies. The dielectric functions of annealed LAO are well fitted with the Drude-Lorentz model.",

author = "Xingquan Zou and Mi He and Daniel Springer and Dongwook Lee and Naiz, {Saritha K.} and {Ann Cheong}, Siew and Tao Wu and C. Panagopoulos and D. Talbayev and Chia, {Elbert E.M.}",

year = "2012",

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doi = "10.1063/1.3679725",

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Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies. / Zou, Xingquan; He, Mi; Springer, Daniel; Lee, Dongwook; Naiz, Saritha K.; Ann Cheong, Siew; Wu, Tao; Panagopoulos, C.; Talbayev, D.; Chia, Elbert E.M.

In: AIP Advances, Vol. 2, No. 1, 038, 01.12.2012.

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

TY - JOUR

T1 - Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies

AU - Zou, Xingquan

AU - He, Mi

AU - Springer, Daniel

AU - Lee, Dongwook

AU - Naiz, Saritha K.

AU - Ann Cheong, Siew

AU - Wu, Tao

AU - Panagopoulos, C.

AU - Talbayev, D.

AU - Chia, Elbert E.M.

PY - 2012/12/1

Y1 - 2012/12/1

N2 - We present THz conductivity of LaAlO3 (LAO) as a function of temperature and annealing, using terahertz time-domain spectroscopy (THz-TDS). We observed that, after annealing, spectral weight redistribution occurs, such that the real conductivity ?1(ω) changed from a featureless and almost frequency-independent spectrum, into one where peaks occur near the phonon frequencies. These phonon frequencies increase with increasing temperature.We attribute the appearance of these absorption peaks to the diffusion and relocation of oxygen vacancies. The dielectric functions of annealed LAO are well fitted with the Drude-Lorentz model.

AB - We present THz conductivity of LaAlO3 (LAO) as a function of temperature and annealing, using terahertz time-domain spectroscopy (THz-TDS). We observed that, after annealing, spectral weight redistribution occurs, such that the real conductivity ?1(ω) changed from a featureless and almost frequency-independent spectrum, into one where peaks occur near the phonon frequencies. These phonon frequencies increase with increasing temperature.We attribute the appearance of these absorption peaks to the diffusion and relocation of oxygen vacancies. The dielectric functions of annealed LAO are well fitted with the Drude-Lorentz model.

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U2 - 10.1063/1.3679725

DO - 10.1063/1.3679725

M3 - Article

AN - SCOPUS:84874066198

VL - 2

JO - AIP Advances

JF - AIP Advances

SN - 2158-3226

IS - 1

M1 - 038

ER -

Effect of annealing on the temperature-dependent dielectric properties of LaAlO3 at terahertz frequencies

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