J A Souza and R F Jardim 2009 J. Phys. D: Appl. Phys. 42 032006 doi:10.1088/0022-3727/42/3/032006
J A Souza1 and R F Jardim2
Show affiliationsMagnetic M(T, H, P) and electrical transport ρ(T, H, P) measurements in a strong spin–lattice–charge coupled La0.7Ca0.3MnO3 system have been conducted. The application of H and P leads to the formation of different magnetic domain structures in the vicinity and below the polaronic-to-ferromagnetic transition temperature. The charge mobility is more sensitive to the variation of the spatial wave function overlap between Mn3+ eg and O2− 2p orbitals due to the applied compacting pressure rather than the relative spin orientation between neighbouring Mn ions when the magnetic field is applied. In spite of the presence of different magnetic domain structures due to the sample history, the effect of magnetic field and pressure is less pronounced at lower temperatures on electrical transport properties.
75.60.Ch Domain walls and domain structure
75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Issue 3 (7 February 2009)
Received 18 September 2008, in final form 10 December 2008
Published 9 January 2009
J A Souza and R F Jardim 2009 J. Phys. D: Appl. Phys. 42 032006
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