Spin-phonon coupling in ZnCr2Se4
强关联电子
2007-07-05 v1
摘要
Spin-phonon coupling and magnetodielectric effects of ZnCr2Se4 were investigated by means of infrared (IR) spectroscopy as a function of temperature and magnetic field. ZnCr2Se4 is dominated by ferromagnetic exchange but undergoes antiferromagnetic order at T = 21 K. In the magnetically ordered phase the low-frequency IR active phonon splits, indicating strong dynamic anisotropy via magnetic exchange interactions. Antiferromagnetic order and concomitantly the phonon splitting is wiped out by external magnetic fields. Hence, ZnCr2Se4 is a prominent example of a spin-driven Jahn-Teller effect which can be fully suppressed in external magnetic fields.
引用
@article{arxiv.cond-mat/0611041,
title = {Spin-phonon coupling in ZnCr2Se4},
author = {T. Rudolf and Ch. Kant and F. Mayr and J. Hemberger and V. Tsurkan and A. Loidl},
journal= {arXiv preprint arXiv:cond-mat/0611041},
year = {2007}
}
备注
5 pages, 4 figures