Ferromagnetic insulating phase in Pr{1-x}Ca{x}MnO3

Details Ferromagnetic insulating phase in Pr{1-x}Ca{x}MnO3 Ferromagnetic insulating phase in Pr{1-x}Ca{x}MnO3

2003-06-25

arxiv.org/abs/cond-mat/0306631v1

Phys. Rev. 69, 054433 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

REVTeX4, 10 pages, 9 figures

Scientific paper

10.1016/S0921-4526(02)02629-7

A ferromagnetic insulating (FM-I) state in Pr0.75Ca0.25MnO3 has been studied by neutron scattering experiment and theoretical calculation. The insulating behavior is robust against an external magnetic field, and is ascribed to neither the phase separation between a ferromagnetic metallic (FM-M) phase and a non-ferromagnetic insulating one, nor the charge ordering. We found that the Jahn-Teller type lattice distortion is much weaker than PrMnO3 and the magnetic interaction is almost isotropic. These features resembles the ferromagnetic metallic state of manganites, but the spin exchange interaction J is much reduced compared to the FM-M state. The theoretical calculation based on the staggered type orbital order well reproduces several features of the spin and orbital state in the FM-I phase.

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