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American Physical Society, Physical review B, 2(91)

DOI: 10.1103/physrevb.91.024513

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Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO

Journal article published in 2015 by G. Lamura, T. Shiroka, P. Bonf, P. Bonfà, S. Sanna, R. De Renzi ORCID, M. Putti ORCID, N. D. Zhigadlo, S. Katrych, R. Khasanov ORCID, J. Karpinski
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This paper is available in a repository.

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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.