Ultrafast transient increase of oxygen octahedral rotations in a perovskite

被引：19

作者：

Porer, M. ^{[1
]}

Fechner, M. ^{[2
]}

Kubli, M. ^{[3
]}

Neugebauer, M. J. ^{[3
]}

Parchenko, S. ^{[1
]}

Esposito, V ^{[4
]}

Narayan, A. ^{[5
]}

Spaldin, N. A. ^{[5
]}

Huber, R. ^{[6
]}

Radovic, M. ^{[1
]}

Bothschafter, E. M. ^{[1
]}

Glownia, J. M. ^{[7
]}

Sato, T. ^{[7
]}

Song, S. ^{[7
]}

Johnson, S. L. ^{[3
,4
]}

Staub, U. ^{[1
]}

机构：

[1] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[2] Max Planck Inst Struct & Dynam Matter, CFEL, D-22761 Hamburg, Germany

[3] Swiss Fed Inst Technol, Inst Quantum Elect, CH-8093 Zurich, Switzerland

[4] Paul Scherrer Inst, SwissFEL, CH-5232 Villigen, Switzerland

[5] Swiss Fed Inst Technol, Mat Theory, CH-8093 Zurich, Switzerland

[6] Univ Regensburg, Dept Phys, D-93040 Regensburg, Germany

[7] SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA

来源：

PHYSICAL REVIEW RESEARCH | 2019年 / 1卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

LIGHT-INDUCED SUPERCONDUCTIVITY; PHASE-TRANSITIONS; DYNAMICS; DRIVEN; ORDER;

D O I：

10.1103/PhysRevResearch.1.012005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present femtosecond hard x-ray diffraction experiments that study the effect of photodoping on the perovskite EuTiO3. We observe an ultrafast transient increase of reflection intensities that are directly related to the antiferrodistortive rotation of the oxygen octahedra. This increase relates directly to an increase of the order parameter associated with a purely structural phase transition that is opposite to the behavior of increasing the materials temperature. First-principles calculations show that the creation of electron-hole pairs leads to changes in the vibrational potential that is consistent with an increase of the order parameter. The order parameter increase can be understood from an ultrafast charge-transfer-induced reduction of the Goldschmidt tolerance factor, which is a fundamental control parameter for the properties of perovskites.

引用

页数：5

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