%0 Journal Article
%T Ferromagnetism and superconductivity in P-doped CeFeAsO
%A A. Jesche
%A T. F£¿rster
%A J. Spehling
%A M. Nicklas
%A M. de Souza
%A R. Gumeniuk
%A H. Luetkens
%A T. Goltz
%A C. Krellner
%A M. Lang
%A J. Sichelschmidt
%A H. -H. Klauss
%A C. Geibel
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevB.86.020501
%X 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.
%U http://arxiv.org/abs/1206.7088v2