Neutron Scattering Studies of spin excitations in hole-doped Ba0.67K0.33Fe2As2 superconductor

We report inelastic neutron scattering experiments on single crystals of superconducting Ba 0.67 K 0.33 Fe 2 As 2 ( T c = 38 K). In addition to confirming the resonance previously found in powder samples, we find that spin excitations in the normal state form longitudinally elongated ellipses along...

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Bibliographic Details
Published in:Scientific reports 2011-10, Vol.1 (1), p.115, Article 115
Main Authors: Zhang, Chenglin, Wang, Meng, Luo, Huiqian, Wang, Miaoyin, Liu, Mengshu, Zhao, Jun, Abernathy, D. L., Maier, T. A., Marty, Karol, Lumsden, M. D., Chi, Songxue, Chang, Sung, Rodriguez-Rivera, Jose A., Lynn, J. W., Xiang, Tao, Hu, Jiangping, Dai, Pengcheng
Format: Article
Language:English
Subjects:
639/301/119/995
639/301/119/997
639/766/119/1003
639/766/483
ANISOTROPY
Crystals
FUNCTIONALS
Humanities and Social Sciences
MAGNETIC MATERIALS
Magnetism
MONOCRYSTALS
multidisciplinary
Neutron scattering
NEUTRONS
PHOTOEMISSION
PHYSICS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Powder
RESONANCE
SCATTERING
Science
SPIN
SUPERCONDUCTORS
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Summary:We report inelastic neutron scattering experiments on single crystals of superconducting Ba 0.67 K 0.33 Fe 2 As 2 ( T c = 38 K). In addition to confirming the resonance previously found in powder samples, we find that spin excitations in the normal state form longitudinally elongated ellipses along the Q AFM direction in momentum space, consistent with density functional theory predictions. On cooling below T c , while the resonance preserves its momentum anisotropy as expected, spin excitations at energies below the resonance become essentially isotropic in the in-plane momentum space and dramatically increase their correlation length. These results suggest that the superconducting gap structures in Ba 0.67 Ka 0.33 Fe 2 As 2 are more complicated than those suggested from angle resolved photoemission experiments.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep00115