Spin-phonon coupling in multiferroic RCrO3 (R-Y, Lu, Gd, Eu, Sm): A Raman study

被引：137

作者：

Bhadram, Venkata Srinu ^{[1
]}

Rajeswaran, B. ^{[1
]}

Sundaresan, A. ^{[1
]}

Narayana, Chandrabhas ^{[1
]}

机构：

[1] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India

来源：

EPL | 2013年 / 101卷 / 01期

关键词：

SCATTERING; SPECTROSCOPY; SPECTRA;

D O I：

10.1209/0295-5075/101/17008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Raman study on a select few orthochromites, RCrO3 (R = Y, Lu, Gd, Eu and Sm), shows that the phonon behavior at T-N in compounds with magnetic R-ion (Gd and Sm) is remarkably different from that of non-magnetic R-ion (Y, Lu and Eu). While anomalies in most of the observed phonon frequencies in all these compounds may result from the distortion of CrO6 octahedra due to size effect and magnetostriction arising from Cr-ordering, the anomalous behavior of their linewidths observed at T-N for the compounds with only magnetic R-ion suggests spin-phonon coupling. The presence of spin-phonon coupling and the anomalies in the low-frequency modes related to R-ion motion in orthochromites (R = Gd and Sm) support the suggestion that the coupling between 4f-3d moments play an important role in inducing switchable electric polarization. Copyright (C) EPLA, 2013

引用

页数：6

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