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Fragility of ferromagnetic double exchange interactions and pressure tuning of magnetism in 3d-5d double perovskite Sr2FeOsO6

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Autor(es):
Veiga, L. S. I. ; Fabbris, G. ; van Veenendaal, M. ; Souza-Neto, N. M. ; Feng, H. L. ; Yamaura, K. ; Haskel, D.
Número total de Autores: 7
Tipo de documento: Artigo Científico
Fonte: PHYSICAL REVIEW B; v. 91, n. 23, p. 7-pg., 2015-06-19.
Resumo

The ability to tune exchange (magnetic) interactions between 3d transition metals in perovskite structures has proven to be a powerful route to discovery of novel properties. Here we demonstrate that the introduction of 3d-5d exchange pathways in double perovskites enables additional tunability, a result of the large spatial extent of 5d wave functions. Using x-ray probes of magnetism and structure at high pressure, we show that compression of Sr2FeOsO6 drives an unexpected continuous change in the sign of Fe-Os exchange interactions and a transition from antiferromagnetic to ferrimagnetic order. We analyze the relevant electron-electron interactions, shedding light into fundamental differences with the more thoroughly studied 3d-3d systems. (AU)

Processo FAPESP: 13/14338-3 - Competição entre supercondutividade e magnetismo em sistemas sob pressão e filmes finos
Beneficiário:Larissa Sayuri Ishibe Veiga
Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado