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

Wang, Meng; Zhang, Chenglin; Lu, Xingye; Tan, Guotai; Luo, Huiqian; Song, Yu; Wang, Miaoyin; Zhang, Xiaotian; Goremychkin, E. A.; Perring, T. G.; Maier, T. A.; Yin, Zhiping; Haule, Kristjan; Kotliar, Gabriel; Dai, Pengcheng

doi:10.1038/ncomms3874

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

Journal Article · Wed Dec 04 00:00:00 EST 2013 · Nature Communications

DOI:https://doi.org/10.1038/ncomms3874· OSTI ID:1565161

Wang, Meng ^[1]; Zhang, Chenglin ^[2]; Lu, Xingye ^[3]; Tan, Guotai ^[4]; Luo, Huiqian ^[1]; Song, Yu ^[2]; Wang, Miaoyin ^[4]; Zhang, Xiaotian ^[1]; Goremychkin, E. A. ^[5]; Perring, T. G. ^[5]; Maier, T. A. ^[6]; Yin, Zhiping ^[7]; Haule, Kristjan ^[7]; Kotliar, Gabriel ^[7]; Dai, Pengcheng ^[8]

Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing National Lab. for Condensed Matter Physics
Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing National Lab. for Condensed Matter Physics; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Rutherford Appleton Lab., Didcot, Oxfordshire (United Kingdom). ISIS Facility
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS) and Computer Science and Mathematics Division
Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics, Beijing National Lab. for Condensed Matter Physics; Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

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 (<50 meV) without affecting the high-energy spin excitations (>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 T_C can account for the superconducting condensation energy. These results suggest that high-T_C 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.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); Rutgers Univ., Piscataway, NJ (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46202; FG02-99ER45761

OSTI ID:: 1565161

Journal Information:: Nature Communications, Vol. 4, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 90 works

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