Structure and correlation effects in semiconducting SrTiO3

被引：74

作者：

Chang, Young Jun ^{[1
,2
]}

Bostwick, Aaron ^{[1
]}

Kim, Yong Su ^{[1
,3
]}

Horn, Karsten ^{[2
]}

Rotenberg, Eli ^{[1
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA

[2] Max Planck Gesell, Fritz Haber Inst, Dept Mol Phys, D-14195 Berlin, Germany

[3] Hanyang Univ, Dept Appl Phys, Ansan 426791, Gyeonggi Do, South Korea

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 23期

关键词：

2-DIMENSIONAL ELECTRON-GAS; DOPED SRTIO3; PHASE-TRANSITION; TEMPERATURE; OXIDES; STATE; INTERFACE; SURFACE; BANDS;

D O I：

10.1103/PhysRevB.81.235109

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the effects of structure change and electron correlation on SrTiO3 single crystals using angle-resolved photoemission spectroscopy. We show that the cubic to tetragonal phase transition at 105 K is manifested by a charge transfer from in-plane (d(yz) and d(zx)) bands to out-of-plane (d(xy)) band, which is opposite to the theoretical predictions. Along this second-order phase transition, we find a smooth evolution of the quasiparticle strength and effective masses. The in-plane band exhibits a peak-dip-hump lineshape, indicating a high degree of correlation on a relatively large (170 meV) energy scale, which is attributed to the polaron formation.

引用

页数：4

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