Nanoscopic coexistence of magnetic and superconducting states within the FeAs layers of CeFeAsO1-xFx

Abstract

We report on the coexistence of magnetic and superconducting states in CeFeAsO1-xFx for x=0.06(2), characterized by transition temperatures T_m=30 K and T_c=18 K, respectively. Zero and transverse field muon-spin relaxation measurements show that below 10 K the two phases coexist within a nanoscopic scale over a large volume fraction. This result clarifies the nature of the magnetic-to-superconducting transition in the CeFeAsO1-xFx phase diagram, by ruling out the presence of a quantum critical point which was suggested by earlier studies.

4 pages, 3 figs, accepted for publication as PRB Rapid comm

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• Slow magnetic fluctuations and superconductivity in fluorine-doped NdFeAsO
• A unified phase diagram of F-doped LaFeAsO by means of NMR and NQR parameters
• Role of magnetic dopants in the phase diagram of Sm1111 pnictides: The Mn case
• Phase separation at the magnetic-superconducting transition in La${}_{0.7}$Y${}_{0.3}$FeAsO${}_{1-x}$F${}_x$
• Crossover between magnetism and superconductivity in low H-doped LaFeAsO
• The Principle Of Local Rotational Invariance And The Coexistence Of Magnetism, Charge And Superconductivity