Electronic and Magnetic Phase Diagram of a Superconductor, SmFeAsO1-xFx

Details Electronic and Magnetic Phase Diagram of a Superconductor, SmFeAsO1-xFx Electronic and Magnetic Phase Diagram of a Superconductor, SmFeAsO1-xFx

2009-04-21

arxiv.org/abs/0904.3173v2

New J. Phys. 12 (2010) 033005

Physics

Condensed Matter

Superconductivity

Accepted in New Journal of Physics

Scientific paper

10.1088/1367-2630/12/3/033005

A crystallographic and magnetic phase diagram of SmFeAsO1-xFx is determined as a function of x in terms of temperature based on electrical transport and magnetization, synchrotron powder x-ray diffraction, 57Fe Mossbauer spectra (MS), and 149Sm nuclear resonant forward scattering (NRFS) measurements. MS revealed that the magnetic moments of Fe were aligned antiferromagnetically at ~144 K (TN(Fe)). The magnetic moment of Fe (MFe) is estimated to be 0.34 myuB/Fe at 4.2 K for undoped SmFeAsO; MFe is quenched in superconducting F-doped SmFeAsO. 149Sm NRFS spectra revealed that the magnetic moments of Sm start to order antiferromagnetically at 5.6 K (undoped) and 4.4 K (TN(Sm)) (x = 0.069). Results clearly indicate that the antiferromagnetic Sm sublattice coexists with the superconducting phase in SmFeAsO1-xFx below TN(Sm), while antiferromagnetic Fe sublattice does not coexist with the superconducting phase.

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