Electron-soft phonon scattering in n-type SrTiO3

被引：8

作者：

Zhou, W. X. ^{[1
,2
]}

Zhou, J. ^{[1
,2
]}

Li, C. J. ^{[3
,4
]}

Zeng, S. W. ^{[1
,2
]}

Huang, Z. ^{[1
,2
]}

Ma, H. J. Harsan ^{[1
,2
]}

Han, K. ^{[1
,2
]}

Lim, Z. S. ^{[1
,2
]}

Wan, D. Y. ^{[1
,2
]}

Zhang, L. C. ^{[1
,2
]}

Venkatesan, T. ^{[1
,2
,3
,4
,5
]}

Feng, Y. P. ^{[2
]}

Ariando ^{[1
,2
,4
]}

机构：

[1] Natl Univ Singapore, NUSNNI NanoCore, Singapore 117411, Singapore

[2] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[3] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117575, Singapore

[4] Natl Univ Singapore, NUS Grad Sch Integrat Sci & Engn, Singapore 117456, Singapore

[5] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 19期

基金：

新加坡国家研究基金会;

关键词：

INITIO MOLECULAR-DYNAMICS; AUGMENTED-WAVE METHOD; SEMICONDUCTING SRTIO3; HIGH-MOBILITY; SUPERCONDUCTIVITY; GAS; TRANSITION; INTERFACE; METALS;

D O I：

10.1103/PhysRevB.94.195122

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

SrTiO3 undergoes a cubic to tetragonal phase transition at T-c = 105-110 K, which can be described by a Brillouin zone corner Gamma(25) (111) soft phonon. Even though clear anomalies in specific heat, thermal expansion coefficient, and sound velocity have been observed, the correlation between phase transition and electronic transport properties in n-type doped SrTiO3 is still controversial. Here, we report phase transition induced electronic transport anomaly in temperature dependence of the temperature coefficient of resistance (TCR) consistently observed in a wide variety of SrTiO3-based systems by detailed transport measurements and first-principles calculations. The observed TCR anomaly, which can be well fitted with the electron-Gamma(25) soft phonon scattering around Tc, is found to be caused by anomalies in both mobility and carrier density, with the former taking the dominant role. Moreover, the magnitude of the anomaly is found to decrease with increasing carrier density. These findings demonstrate the role of the electron-Gamma(25) soft phonon scattering in the conduction mechanism in SrTiO3-based systems.

引用

页数：7

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