Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides

Meng Wang, Chenglin Zhang, Xingye Lu, Guotai Tan, Huiqian Luo, Yu Song, Miaoyin Wang, Xiaotian Zhang, E.A. Goremychkin, T.G. Perring, T.A. Maier, Zhiping Yin, Kristjan Haule, Gabriel Kotliar and Pengcheng Dai ()
Additional contact information
Meng Wang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Chenglin Zhang: Rice University
Xingye Lu: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Guotai Tan: The University of Tennessee
Huiqian Luo: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Yu Song: Rice University
Miaoyin Wang: The University of Tennessee
Xiaotian Zhang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
E.A. Goremychkin: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot
T.G. Perring: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot
T.A. Maier: Oak Ridge National Laboratory
Zhiping Yin: Rutgers University
Kristjan Haule: Rutgers University
Gabriel Kotliar: Rutgers University
Pengcheng Dai: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

Nature Communications, 2013, vol. 4, issue 1, 1-10

Abstract: Abstract High-temperature superconductivity in iron pnictides occurs when electrons and holes are doped into their antiferromagnetic parent compounds. Since spin excitations may be responsible for electron pairing and superconductivity, it is important to determine their electron/hole-doping evolution and connection with superconductivity. Here we use inelastic neutron scattering to show that while electron doping to the antiferromagnetic BaFe2As2 parent compound modifies the low-energy spin excitations and their correlation with superconductivity ( 100 meV), hole-doping suppresses the high-energy spin excitations and shifts the magnetic spectral weight to low-energies. In addition, our absolute spin susceptibility measurements for the optimally hole-doped iron pnictide reveal that the change in magnetic exchange energy below and above Tc can account for the superconducting condensation energy. These results suggest that high-Tc superconductivity in iron pnictides is associated with both the presence of high-energy spin excitations and a coupling between low-energy spin excitations and itinerant electrons.

Date: 2013
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DOI: 10.1038/ncomms3874

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