Microscopic spin interactions in the CMR manganites

J. A. Fernandez-Baca; Pengcheng Dai; H. Kawano-Furukawa; H. Yoshizawa; E. W. Plummer; S. Katano; Y. Tomioka; Y. Tokura

Microscopic spin interactions in the CMR manganites

Strongly Correlated Electrons 2007-05-23 v1

Authors: J. A. Fernandez-Baca , Pengcheng Dai , H. Kawano-Furukawa , H. Yoshizawa , E. W. Plummer , S. Katano , Y. Tomioka , Y. Tokura

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Abstract

Using inelastic neutron scattering we measured the microscopic magnetic coupling associated with the ferromagnetic (FM) clusters of the ``colossal magnetoresistance'' (CMR) compound Pr $_{0.70}$ Ca $_{0.30}$ MnO $_3$ . When the insulating to metal (I-M) transition is induced by an external magnetic field there is a discontinuous change in the spin-wave stiffness constant. This result indicates that the probed regions undergo a first-order transition from an insulating to a metallic state, and that there are no FM metallic domains in the insulating region. We argue that the I-M transition in the CMR manganites is more complex than the simple percolation of large FM metallic clusters.

Keywords

manganites frustrated magnetism magnetocaloric effect

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@article{arxiv.cond-mat/0110659,
  title  = {Microscopic spin interactions in the CMR manganites},
  author = {J. A. Fernandez-Baca and Pengcheng Dai and H. Kawano-Furukawa and H. Yoshizawa and E. W. Plummer and S. Katano and Y. Tomioka and Y. Tokura},
  journal= {arXiv preprint arXiv:cond-mat/0110659},
  year   = {2007}
}

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4 pages, 4 figures

Microscopic spin interactions in the CMR manganites

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