Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides
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 (<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 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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1565161
- Grant/Contract Number:
- FG02-05ER46202; FG02-99ER45761
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; science & technology
Citation Formats
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, and Dai, Pengcheng. Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides. United States: N. p., 2013.
Web. doi:10.1038/ncomms3874.
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. Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides. United States. https://doi.org/10.1038/ncomms3874
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, and Dai, Pengcheng. Wed .
"Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides". United States. https://doi.org/10.1038/ncomms3874. https://www.osti.gov/servlets/purl/1565161.
@article{osti_1565161,
title = {Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides},
author = {Wang, Meng and Zhang, Chenglin and Lu, Xingye and Tan, Guotai and Luo, Huiqian and Song, Yu and Wang, Miaoyin and Zhang, Xiaotian and Goremychkin, E. A. and Perring, T. G. and Maier, T. A. and Yin, Zhiping and Haule, Kristjan and Kotliar, Gabriel and Dai, Pengcheng},
abstractNote = {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 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.},
doi = {10.1038/ncomms3874},
journal = {Nature Communications},
number = 1,
volume = 4,
place = {United States},
year = {Wed Dec 04 00:00:00 EST 2013},
month = {Wed Dec 04 00:00:00 EST 2013}
}
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