Microscopic spin interactions in colossal magnetoresistance manganites

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

doi:10.1103/PhysRevB.66.054434

Microscopic spin interactions in colossal magnetoresistance manganites

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

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Abstract

Using inelastic neutron scattering we measured the microscopic magnetic coupling associated with the ferromagnetic clusters of the "colossal magnetoresistance" compound Pro_0.70Ca_0.30MnO₃. 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 implies that the I-M transition is not achieved by the simple percolation of micron-sized metallic clusters as currently believed, but involves a first-order transformation.

Original language	English
Article number	054434
Pages (from-to)	544341-544345
Number of pages	5
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	66
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.66.054434
State	Published - Aug 1 2002

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Fernandez-Baca, J. A., Dai, P., Dai, P., Kawano-Furukawa, H., Yoshizawa, H., Plummer, E. W., Plummer, E. W., Katano, S., Tomioka, Y., Tomioka, Y., & Tokura, Y. (2002). Microscopic spin interactions in colossal magnetoresistance manganites. Physical Review B - Condensed Matter and Materials Physics, 66(5), 544341-544345. Article 054434. https://doi.org/10.1103/PhysRevB.66.054434

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abstract = "Using inelastic neutron scattering we measured the microscopic magnetic coupling associated with the ferromagnetic clusters of the {"}colossal magnetoresistance{"} compound Pro0.70Ca0.30MnO3. 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 implies that the I-M transition is not achieved by the simple percolation of micron-sized metallic clusters as currently believed, but involves a first-order transformation.",

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AU - Fernandez-Baca, J. A.

AU - Dai, Pengcheng

AU - Kawano-Furukawa, H.

AU - Yoshizawa, H.

AU - Plummer, E. W.

AU - Katano, S.

AU - Tomioka, Y.

AU - Tokura, Y.

PY - 2002/8/1

Y1 - 2002/8/1

N2 - Using inelastic neutron scattering we measured the microscopic magnetic coupling associated with the ferromagnetic clusters of the "colossal magnetoresistance" compound Pro0.70Ca0.30MnO3. 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 implies that the I-M transition is not achieved by the simple percolation of micron-sized metallic clusters as currently believed, but involves a first-order transformation.

AB - Using inelastic neutron scattering we measured the microscopic magnetic coupling associated with the ferromagnetic clusters of the "colossal magnetoresistance" compound Pro0.70Ca0.30MnO3. 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 implies that the I-M transition is not achieved by the simple percolation of micron-sized metallic clusters as currently believed, but involves a first-order transformation.

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

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Microscopic spin interactions in colossal magnetoresistance manganites

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