Marked enhancement of Neel temperature in strained YMnO3 thin films probed by femtosecond spectroscopy

被引：23

作者：

Wu, K. H. ^{[1
]}

Chen, H-J ^{[1
]}

Chen, Y. T. ^{[1
]}

Hsieh, C. C. ^{[1
]}

Luo, C. W. ^{[1
]}

Uen, T. M. ^{[1
]}

Juang, J. Y. ^{[1
]}

Lin, J-Y ^{[2
]}

Kobayashi, T. ^{[1
,4
,5
]}

Gospodinov, M. ^{[3
]}

机构：

[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan

[2] Natl Chiao Tung Univ, Inst Phys, Hsinchu 300, Taiwan

[3] Bulgarian Acad Sci, Inst Solid State Phys, BU-1784 Sofia, Bulgaria

[4] Univ Electrocommun, Inst Laser Sci, Tokyo 1828585, Japan

[5] Univ Electrocommun, Dept Appl Phys & Chem, Tokyo 1828585, Japan

来源：

EPL | 2011年 / 94卷 / 02期

关键词：

FERROELECTRICITY; MULTIFERROICS;

D O I：

10.1209/0295-5075/94/27006

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper, the (001)-oriented hexagonal YMnO3 (h-YMO) thin films with various nominal strain states were deposited on MgO(100), MgO(111) and YSZ(111) substrates by pulsed laser deposition. The ultrafast dynamics probed by wavelength-tunable femtosecond pump-probe spectroscopy was performed to disclose the effects of the epitaxial strain on the electronic structure and associated magnetism. Analyses based on the measured transient-reflectivity-change (Delta R/R) curves revealed that while the magnitude of the on-site Mn d-d transition energy E-dd(T) changes only slightly with the variation of the lattice constant ratio c/a, a marked shift in the antiferromagnetic (AFM) Neel temperature T-N was observed and the direction of shift was dependent on the type of strain. The possible mechanism for the observed strain effect on the AFM ordering is discussed. Copyright (C) EPLA, 2011

引用

页数：6

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