Ferromagnetism and superconductivity in CeFeAs1-xPxO (0 <= x <= 40)

TitleFerromagnetism and superconductivity in CeFeAs1-xPxO (0 <= x <= 40)
Publication TypeJournal Article
Year of Publication2012
AuthorsJesche A, Forster T, Spehling J, Nicklas M, de Souza M, Gumeniuk R, Luetkens H, Goltz T, Krellner C, Lang M, Sichelschmidt J, Klauss HH, Geibel C
Journal TitlePhysical Review B
Date Published07
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000306088700001

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 TSC congruent to T-C congruent to 4 K. The antiferromagnetic (AFM) ordering temperature of Fe at this critical concentration is suppressed to T-N(Fe) approximate to 40 K and does not shift to lower temperatures with a further increase of the P concentration. Therefore, a quantum-critical-point scenario with T-N(Fe) -> 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.

URL<Go to ISI>://WOS:000306088700001
Alternate JournalPhys. Rev. B