Mössbauer Studies of <math>57Fe: YBa2 Cu307</math> at High Temperatures

Nota de FísicaPublicado

Mössbauer Studies of $<math>^{57}Fe: YBa_2 Cu_30_7</math>$ at High Temperatures

E. M. B. Saitovitch; Izabel de Souza Azevedo; R. B. Scorzelli

1988

Autores: E. M. B. Saitovitch; Izabel de Souza Azevedo; R. B. Scorzelli
Tipo: Nota de Física
Status: Publicado
Data de publicação: 1988
Descrição: The substitution of Cu by Fe in the <math>YBa_2(Cu_{1-x}Fe_x)\,\!</math> <math>_30_y\,\!</math> superconductor induces different effects above and below x =0.01, as seen by DC magnetization and Mössbauer measurements, despite the fact that the X-ray diffraction still shows the orthorhombic structure. Two iron species associated with doublets D1 and D2 are assigned to the occupation of Cul sites with different oxygen coordination, their isomer shift values are consistent with a <math>Fe^{+4}\,\!</math> high spin configuration. The Mössbauer spectra obtained, in air, at fixed temperatures from 25 C until 298 C revealed a clear modification of the relative intensity of D1 and D2 before the formation of the iron species related to the oxygen deficient phase.
Ano: 1988
Número: CBPF-NF-077/88
Vínculo com tese: Não
Vínculo com bolsa: Não