Ferromagnetism and superconductivity in CeFeAs 1-xP xO (0≤x≤40)
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2012-07-05
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Jesche, A.
Förster, T.
Spehling, J.
Nicklas, M.
De Souza, M. [UNESP]
Gumeniuk, R.
Luetkens, H.
Goltz, T.
Krellner, C.
Lang, M.
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We report on superconductivity in CeFeAs 1-xP xO and the possible coexistence with Ce ferromagnetism (FM) in a small homogeneity range around x=30% with ordering temperatures of T SC≅T C≅4 K. The antiferromagnetic (AFM) ordering temperature of Fe at this critical concentration is suppressed to TNFe≈40 K and does not shift to lower temperatures with a further increase of the P concentration. Therefore, a quantum-critical-point scenario with TNFe→0 K which is widely discussed for the iron based superconductors can be excluded for this alloy series. Surprisingly, thermal expansion and x-ray powder diffraction indicate the absence of an orthorhombic distortion despite clear evidence for short-range AFM Fe ordering from muon-spin-rotation measurements. Furthermore, we discovered the formation of a sharp electron spin resonance signal unambiguously connected with the emergence of FM ordering. © 2012 American Physical Society.
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Physical Review B - Condensed Matter and Materials Physics, v. 86, n. 2, 2012.