Electrical transport in disordered and ordered magnetic domains under pressures and magnetic fields

Autor(es)

Souza, J. A. ^[1] ; Jardim, R. F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09090900 Santo Andre, SP - Brazil

^[2] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PHYSICS D-APPLIED PHYSICS; v. 42, n. 3 FEB 7 2009.
• Citações Web of Science: 1

Resumo

Magnetic M( T, H, P) and electrical transport.( T, H, P) measurements in a strong spin-lattice-charge coupled La(0.7)Ca(0.3)MnO(3) 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 Mn(3+) eg and O(2-) 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. (AU)

• Processo FAPESP: 05/53241-9 - Estudo de fenômenos intergranulares em materiais cerâmicos
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 07/01039-7 - Estudo do comportamento critico de transicoes de fase em sistemas com propriedades magneticas, eletronicas e estruturais fortemente correlacionadas.
• Beneficiário: José Antonio Souza
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado