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Phase separation at the magnetic-superconducting transition in La0.7Y0.3FeAsO1-xFx (Articolo in rivista)

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Phase separation at the magnetic-superconducting transition in La0.7Y0.3FeAsO1-xFx (Articolo in rivista) (literal)

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Prando, G.a , Sanna, S.b, Lamura, G.c, Shiroka, T.d, Tropeano, M.ce, Palenzona, A.c, Grafe, H.-J.a, Büchner, B.af, Carretta, P.b, De Renzi, R.g (2013)
Phase separation at the magnetic-superconducting transition in La0.7Y0.3FeAsO1-xFx
in Physica status solidi. B, Basic research (Internet)
(literal)

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Prando, G.a , Sanna, S.b, Lamura, G.c, Shiroka, T.d, Tropeano, M.ce, Palenzona, A.c, Grafe, H.-J.a, Büchner, B.af, Carretta, P.b, De Renzi, R.g (literal)

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a Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, D-01171 Dresden, Germany b Dipartimento di Fisica and Unità CNISM di Pavia, Università di Pavia, I-27100 Pavia, Italy c CNR-SPIN and Università di Genova, I-16146 Genova, Italy d Laboratorium für Festkörperphysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland e Columbus Superconductors S. p. A., I-16133 Genova, Italy f Institut für Festkörperphysik, Technische Universität Dresden, D-01062 Dresden, Germany g Dipartimento di Fisica and Unità CNISM di Parma, Università di Parma, I-43124 Parma, Italy (literal)

Titolo

Phase separation at the magnetic-superconducting transition in La0.7Y0.3FeAsO1-xFx (literal)

Abstract

In this paper we report a detailed ?+SR and 19F NMR study of the La0.7Y0.3FeAsO1-xFx class of materials. Here, the diamagnetic La1-yYy substitution increases chemical pressure and, accordingly, sizeably enhances the optimal superconducting transition temperature. We investigate the magnetic-superconducting phase transition by keeping the Y content constant (y=0.3) and by varying the F content in the range {2}.025\leq x\leq 0.15$. Our results show how magnetism and superconductivity coexist for x=0.065. Such coexistence is due to segregation of the two phases in macroscopic regions, resembling what was observed in LaFeAsO1-xFx materials under applied hydrostatic pressure. This scenario is qualitatively different from the nanoscopic coexistence of the two order parameters observed when La is fully substituted by magnetic rare-earth ions like Sm or Ce. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. (literal)

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