Abstract
We report on superconductivity in CeFeAsPO and the possible coexistence with Ce ferromagnetism (FM) in a small homogeneity range around with ordering temperatures of K. The antiferromagnetic (AFM) ordering temperature of Fe at this critical concentration is suppressed to K and does not shift to lower temperatures with a further increase of the P concentration. Therefore, a quantum-critical-point scenario with 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.
- Received 23 December 2011
- Publisher error corrected 11 July 2012
DOI:https://doi.org/10.1103/PhysRevB.86.020501
©2012 American Physical Society
Corrections
11 July 2012