Ferromagnetism and superconductivity in P-doped CeFeAsO

A. Jesche; T. Förster; J. Spehling; M. Nicklas; M. de Souza; R. Gumeniuk; H. Luetkens; T. Goltz; C. Krellner; M. Lang; J. Sichelschmidt; H. -H. Klauss; C. Geibel

doi:10.1103/physrevb.86.020501

arXiv · 1206.7088

Ferromagnetism and superconductivity in P-doped CeFeAsO

A. Jesche·T. Förster·J. Spehling·M. Nicklas·M. de Souza·R. Gumeniuk·H. Luetkens·T. Goltz·C. Krellner·M. Lang·J. Sichelschmidt·H. -H. Klauss·C. Geibel

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Abstract

We report on superconductivity in CeFeAs1-xPxO and the possible coexistence with Ce- ferromagnetism (FM) in a small homogeneity range around x = 30% with ordering temperatures of T_SC = T_C = 4K. The antiferromagnetic (AFM) ordering temperature of Fe at this critical concentration is suppressed to T^N_Fe ~ 40K and does not shift to lower temperatures with further increase of the P concentration. Therefore, a quantum-critical-point scenario with T^N_Fe -> 0K 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.

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A. Jesche, T. Förster, J. Spehling, M. Nicklas, M. de Souza, R. Gumeniuk, H. Luetkens, T. Goltz, C. Krellner, M. Lang, J. Sichelschmidt, H. -H. Klauss, C. Geibel. 2012-07-12. Ferromagnetism and superconductivity in P-doped CeFeAsO. https://doi.org/10.1103/physrevb.86.020501

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