Among the widely studied superconducting iron-pnictide compounds belonging to the Ln1111 family (with Ln a lanthanide), a systematic investigation of the crossover region between the superconducting and the antiferromagnetic phase for the Ln = Nd case has been missing. We fill this gap by focusing on the intermediate doping regime of NdFeAsO1-xFx by means of dc-magnetometry and muon-spin spectroscopy (μSR) measurements. The long-range order we detect at low fluorine doping is replaced by short-range magnetic interactions at x=0.08, where also superconductivity appears. In this case, longitudinal-field μSR experiments show clear evidence of slow magnetic fluctuations that disappear at low temperatures. This fluctuating component is ascribed to the glassy-like character of the magnetically ordered phase of NdFeAsO at intermediate fluorine doping.

Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO / Lamura, G; Shiroka, Toni; Bonfa', Pietro; Sanna, S.; DE RENZI, Roberto; Putti, M.; Zhigadlo, N. D.; Katrych, S.; Khasanov, R.; Karpinski, J.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 91:2(2015), p. 024513. [10.1103/PhysRevB.91.024513]

Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO

SHIROKA, Toni;BONFA', Pietro;DE RENZI, Roberto;
2015

Abstract

Among the widely studied superconducting iron-pnictide compounds belonging to the Ln1111 family (with Ln a lanthanide), a systematic investigation of the crossover region between the superconducting and the antiferromagnetic phase for the Ln = Nd case has been missing. We fill this gap by focusing on the intermediate doping regime of NdFeAsO1-xFx by means of dc-magnetometry and muon-spin spectroscopy (μSR) measurements. The long-range order we detect at low fluorine doping is replaced by short-range magnetic interactions at x=0.08, where also superconductivity appears. In this case, longitudinal-field μSR experiments show clear evidence of slow magnetic fluctuations that disappear at low temperatures. This fluctuating component is ascribed to the glassy-like character of the magnetically ordered phase of NdFeAsO at intermediate fluorine doping.
Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO / Lamura, G; Shiroka, Toni; Bonfa', Pietro; Sanna, S.; DE RENZI, Roberto; Putti, M.; Zhigadlo, N. D.; Katrych, S.; Khasanov, R.; Karpinski, J.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 91:2(2015), p. 024513. [10.1103/PhysRevB.91.024513]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2817494
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