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Long-to short-range magnetic order in fluorine-doped CeFeAsO (Articolo in rivista)

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Long-to short-range magnetic order in fluorine-doped CeFeAsO (Articolo in rivista) (literal)

Anno

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Alternative label

Shiroka, T; Lamura, G; Sanna, S; Prando, G; De Renzi, R; Tropeano, M; Cimberle, MR; Martinelli, A; Bernini, C; Palenzona, A; Fittipaldi, R; Vecchione, A; Carretta, P; Siri, AS; Ferdeghini, C; Putti M. (2011)
Long-to short-range magnetic order in fluorine-doped CeFeAsO
in Physical review. B, Condensed matter and materials physics; The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
(literal)

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Shiroka, T; Lamura, G; Sanna, S; Prando, G; De Renzi, R; Tropeano, M; Cimberle, MR; Martinelli, A; Bernini, C; Palenzona, A; Fittipaldi, R; Vecchione, A; Carretta, P; Siri, AS; Ferdeghini, C; Putti M. (literal)

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[ 1 ] ETH Honggerberg, Festkorperphys Lab, CH-8093 Zurich, Switzerland [ 2 ] Paul Scherrer Inst, CH-5232 Villigen, Switzerland [ 3 ] CNR, SPIN, I-16146 Genoa, Italy [ 4 ] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy [ 5 ] Dipartimento Fis A Volta, I-27100 Pavia, Italy [ 6 ] Unita CNISM Pavia, I-27100 Pavia, Italy [ 7 ] Univ Roma 3, Dipartimento Fis E Amaldi, I-00146 Rome, Italy [ 8 ] CNISM, I-00146 Rome, Italy [ 9 ] Dipartimento Fis, I-43124 Parma, Italy [ 10 ] Unita CNISM Parma, I-43124 Parma, Italy [ 11 ] CNR, IMEM, I-16146 Genoa, Italy [ 12 ] Univ Genoa, Dipartimento Chim, I-16146 Genoa, Italy [ 13 ] CNR, SPIN, I-84084 Salerno, Italy [ 14 ] Univ Salerno, I-84084 Salerno, Italy (literal)

Titolo

Abstract

The evolution of the antiferromagnetic order parameter in CeFeAsO(1-x)F(x) as a function of the fluorine content x was investigated primarily via zero-field muon-spin spectroscopy. The long-range magnetic order observed in the undoped compound gradually turns into a short-range order at x = 0.04, seemingly accompanied or induced by a drastic reduction of the magnetic moment of the iron ions. Superconductivity appears upon a further increase in doping (x > 0.04) when, unlike in the cuprates, the Fe magnetic moments become even weaker. The resulting phase diagram evidences the presence of a crossover region, where the superconducting and the magnetic order parameters coexist on a nanoscopic range. (literal)

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