Mössbauer study of superconducting NdFeAsO(0.88)F(0.12) and its parent compound NdFeAsO.

Sánchez, D R; Alzamora, M; Munevar, J; Wang, N L; Cheng, G F; Baggio-Saitovitch, E

Sánchez, D R; Alzamora, M; Munevar, J; Wang, N L; Cheng, G F; Baggio-Saitovitch, E.

Afiliação

Sánchez DR; Instituto de Física, Universidade Federal Fluminense, Avenida Milton Tavares de Souza, s/n-Campus da Praia Vermelha, 24210-346 Niterói, RJ, Brazil.

J Phys Condens Matter ; 21(45): 455701, 2009 Nov 11.

Article em En | MEDLINE | ID: mdl-21694017

RESUMO

(57)Fe Mössbauer spectroscopy has been used to investigate the magnetic order of non-superconducting NdFeAsO (T(N) = 140 K) and superconducting NdFeAsO(0.88)F(0.12) (T(c) = 45 K). A magnetic hyperfine field B(hf) was observed at the (57)Fe nucleus below T(N)â¼140 K for NdFeAsO. Below â¼2 K an increase of B(hf) relative to the saturation value was attributed to the transferred B(hf) at the Fe site resulting from the collinear antiferromagnetic (AF) spin structure of the Nd moments. The analysis of the spectra is consistent with a commensurate AF order of Fe spins. No B(hf) is observed in superconducting NdFeAsO(0.88)F(0.12) down to 1.5 K.

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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: J Phys Condens Matter Assunto da revista: BIOFISICA Ano de publicação: 2009 Tipo de documento: Article País de afiliação: Brasil País de publicação: Reino Unido

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