Author/Authors :
Munevar، نويسنده , , J. and Micklitz، نويسنده , , H. and Alzamora، نويسنده , , M. and Argüello، نويسنده , , C. and Goko، نويسنده , , T. and Ning، نويسنده , , F.L. and Munsie، نويسنده , , T. and Williams، نويسنده , , T.J. and Aczel، نويسنده , , A.A. and Luke، نويسنده , , G.M. and Chen، نويسنده , , G.F. and Yu، نويسنده , , W. and Uemura، نويسنده , , Y.J. and Baggio-Saitovitch، نويسنده , , E.، نويسنده ,
Abstract :
We have studied the magnetism in superconducting single crystals of EuFe2As1.4P0.6 by using the local probe techniques of zero-field muon spin rotation/relaxation and 151Eu/57Fe Mössbauer spectroscopy. All of these measurements reveal magnetic hyperfine fields below the magnetic ordering temperature T M = 18 K of the Eu2+ moments. The analysis of the data shows that there is a coexistence of antiferromagnetism, resulting from Eu2+ moments ordered along the crystallographic c-axis, and superconductivity below T SC ≈ 10 K. We find indications for a change in the dynamics of the small Fe magnetic moments (~0.07 μ B ) at T ⁎ ≃ 15 K that may be triggering the onset of superconductivity: below T⁎ the Fe magnetic moments seem to be “frozen” within the ab-plane.
Keywords :
C. ?SR , D. Superconductivity , C. M?ssbauer spectroscopy , A. Iron pnictides
