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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
; | Date: |
31 Oct 2001 | Subject: | Strongly Correlated Electrons | cond-mat.str-el | 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. | Source: | arXiv, cond-mat/0110659 | Services: | Forum | Review | PDF | Favorites |
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