Spin-phonon and magnetostriction phenomena in CaMn7O12 helimagnet probed by Raman spectroscopy

A. Nonatoa; B. A. Souza; A. P. Ayala; A. P. Maciel; S. Y. Villar; M. S. Andujar; A. Senaris-Rodrigues; C. W. A. Paschoal

Spin-phonon and magnetostriction phenomena in CaMn7O12 helimagnet probed by Raman spectroscopy

Materials Science 2014-10-02 v1

Authors: A. Nonatoa , B. A. Souza , A. P. Ayala , A. P. Maciel , S. Y. Villar , M. S. Andujar , A. Senaris-Rodrigues , C. W. A. Paschoal

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Abstract

In this letter we investigated the temperature-dependent Raman spectra of CaMn7O12 helimagnet from room temperature down to 10 K. The temperature dependence of the Raman mode parameters show remarkable anomalies for both antiferromagnetic and incommensurate transitions that this compound undergoes at low temperatures. The anomalies observed at the magnetic ordering transition indicate a spin-phonon coupling at higher-temperature magnetic transition in this material, while a magnetostrinction effect at the lower-temperature magnetic transition.

Keywords

CaMn7O12 helimagnet Raman spectroscopy spin-phonon coupling magnetostriction magnetic phase transition temperature-dependent spectra

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@article{arxiv.1410.0073,
  title  = {Spin-phonon and magnetostriction phenomena in CaMn7O12 helimagnet probed by Raman spectroscopy},
  author = {A. Nonatoa and B. A. Souza and A. P. Ayala and A. P. Maciel and S. Y. Villar and M. S. Andujar and A. Senaris-Rodrigues and C. W. A. Paschoal},
  journal= {arXiv preprint arXiv:1410.0073},
  year   = {2014}
}

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14 pages, 4 figures

Spin-phonon and magnetostriction phenomena in CaMn7O12 helimagnet probed by Raman spectroscopy

Abstract

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