Spin-phonon coupling in ZnCr2Se4

T. Rudolf; Ch. Kant; F. Mayr; J. Hemberger; V. Tsurkan; A. Loidl

doi:10.1103/PhysRevB.75.052410

Spin-phonon coupling in ZnCr2Se4

Strongly Correlated Electrons 2007-07-05 v1

Authors: T. Rudolf , Ch. Kant , F. Mayr , J. Hemberger , V. Tsurkan , A. Loidl

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Abstract

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.

Keywords

frustrated magnetism spintronics spin excitations in condensed matter

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@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}
}

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5 pages, 4 figures

Spin-phonon coupling in ZnCr2Se4

Abstract

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