Ultrafast Structural Dynamics along the β - γ Phase Transition Path in MnAs

被引：8

作者：

Vidal, Franck ^{[1
]}

Zheng, Yunlin ^{[1
]}

Lounis, Lounes ^{[1
,2
]}

Coelho, Leticia ^{[1
,3
]}

Laulhe, Claire ^{[4
,5
]}

Spezzani, Carlo ^{[6
,7
]}

Ciavardini, Alessandra ^{[4
]}

Popescu, Horia ^{[4
]}

Ferrari, Eugenio ^{[7
,8
]}

Allaria, Enrico ^{[7
]}

Ma, Jialin ^{[9
]}

Wang, Hailong ^{[9
]}

Zhao, Jianhua ^{[9
]}

Chollet, Matthieu ^{[10
]}

Seaberg, Matthew ^{[10
]}

Alonso-Mori, Roberto ^{[10
]}

Glownia, James M. ^{[10
]}

Eddrief, Mahmoud ^{[1
]}

Sacchi, Maurizio ^{[1
,4
]}

机构：

[1] Sorbonne Univ, CNRS, Inst NanoSci Paris, INSP, F-75005 Paris, France

[2] PSL Res Univ, F-75231 Paris, France

[3] Univ Brasilia UnB, Inst Fis, BR-70910900 Brasilia, DF, Brazil

[4] Synchrotron SOLEIL, St Aubin BP 48, F-91192 Gif Sur Yvette, France

[5] Univ Paris Saclay, Univ Paris Sud, F-91405 Orsay, France

[6] Univ Paris Saclay, Univ Paris Sud, Lab Phys Solides, CNRS, F-91405 Orsay, France

[7] ELETTRA Sincrotrone Trieste, Area Sci Pk,SS 14,Km 163-5, I-34149 Trieste, Italy

[8] Ecole Polytech Fed Lausanne, Particle Accelerator Phys Lab, CH-1015 Lausanne, Switzerland

[9] Chinese Acad Sci, State Key Lab Superlattices & Microstruct, Inst Semicond, POB 912, Beijing 100083, Peoples R China

[10] SLAC Natl Accelerator Lab, Linac Coherent Light Source, Menlo Pk, CA 94025 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 14期

基金：

瑞士国家科学基金会; 中国国家自然科学基金;

关键词：

MAGNETIC-PROPERTIES; MAGNETORESISTANCE; DISORDER;

D O I：

10.1103/PhysRevLett.122.145702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the orthorhombic distortion and the structural dynamics of epitaxial MnAs layers on GaAs(001) using static and time-resolved x-ray diffraction. Laser-induced intensity oscillations of Bragg reflections allow us to identify the optical phonon associated with orthorhombic distortion and to follow its softening along the path towards an undistorted phase of hexagonal symmetry. The frequency of this mode falls in the THz range, in agreement with recent calculations. Incomplete softening suggests that the beta - gamma transformation deviates from a purely second-order displacive transition.

引用

页数：6

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