Coexistence and Competition of Magnetism and Superconductivity on the Nanometer Scale in Underdoped BaFe<sub>1.89</sub>Co<sub>0.11</sub>As₂

Marsik, Premysl; Kim, Kyung Wan; Dubroka, Adam; Rössle, Matthias; Malik, Vivek Kumar; Schulz, Leander; Wang, Chen Nan; Niedermayer, Ch.; Drew, Alan J.; Willis, M.; Wolf, T.; Bernhard, Christian

doi:10.1103/PhysRevLett.105.057001

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Coexistence and Competition of Magnetism and Superconductivity on the Nanometer Scale in Underdoped BaFe_1.89Co_0.11As₂

Marsik, Premysl University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Kim, Kyung Wan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Dubroka, Adam University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Rössle, Matthias University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Malik, Vivek Kumar University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Schulz, Leander University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Wang, Chen Nan University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
Niedermayer, Ch. Laboratorium for Neutron Scattering, Paul Scherrer Institut & ETH Zürich, Villigen, Switzerland
Drew, Alan J. University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland - Queen Mary University of London, United Kingdom
Willis, M. Queen Mary University of London, United Kingdom
Wolf, T. Karlsruher Institut für Technologie, Institut für Festkörperphysik, Germany
Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland

27.07.2001

Published in:

Physical Review Letters. - 2010, vol. 105, no. 5, p. 057001

English We report muon spin rotation (μSR) and infrared spectroscopy experiments on underdoped BaFe_1.89Co_0.11As₂ which show that bulk magnetism and superconductivity (SC) coexist and compete on the nanometer length scale. Our combined data reveal a bulk magnetic order, likely due to an incommensurate spin density wave (SDW), which develops below T^mag≈32 K and becomes reduced in magnitude (but not in volume) below T_c=21.7 K. A slowly fluctuating precursor of the SDW seems to develop already below the structural transition at T^s≈50 K. The bulk nature of SC is established by the μSR data which show a bulk SC vortex lattice and the IR data which reveal that the majority of low-energy states is gapped and participates in the condensate at T≪T_c.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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