Journal
PHYSICAL REVIEW B
Volume 80, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.012502
Keywords
barium compounds; Fermi surface; iron compounds; neutron diffraction; spin density waves; superconducting materials
Funding
- Department of Energy EPSCoR Implementation [DE-FG02-08ER46528]
- Scientific User Facilities Division
- Division of Materials Science and Engineering, Office of Basic Energy Sciences, Department of Energy
- U.S. Department of Energy (DOE) [DE-FG02-08ER46528] Funding Source: U.S. Department of Energy (DOE)
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Superconductivity appears to compete against the spin-density wave in Fe pnictides. However, optimally cobalt-doped samples show a quasi-two-dimensional spin excitation centered at the (0.5, 0.5, L) wave vector, the spin-resonance peak, which is strongly tied to the onset of superconductivity. By inelastic neutron scattering on single crystals we show the similarities and differences of the spin excitations in BaFe1.84Co0.16As2 with respect to the spin excitations in the high-temperature superconducting cuprates. As in the cuprates, the resonance occurs as an enhancement to a part of the spin-excitation spectrum, which extends to higher-energy transfer and higher temperature. However, unlike in the cuprates, the resonance peak in this compound is asymmetric in energy.
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