期刊
PHYSICAL REVIEW B
卷 80, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.214534
关键词
arsenic alloys; barium alloys; density functional theory; doping; ground states; iron alloys; magnetic domains; phonons
资金
- Department of Energy EPSCoR [DE-FG02-08ER46528]
- Basic Energy Science Division of the Department of Energy
- U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- DOE, Division of Materials Sciences and Engineering
- NSF [0115852]
- U.S. Department of Energy (DOE) [DE-FG02-08ER46528] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0115852] Funding Source: National Science Foundation
We measured phonon frequencies and linewidths in doped and undoped BaFe2As2 single crystals by inelastic x-ray scattering and compared our results with density functional theory calculations. In agreement with previous work, the calculated frequencies of some phonons depended on whether the ground state was magnetic or not and, in the former case, whether phonon wave vector was parallel or perpendicular to the magnetic ordering wave vector. The experimental results agreed better with the magnetic calculation than with zero Fe moment calculations, except the peak splitting expected due to magnetic domain twinning was not observed. Furthermore, phonon frequencies were unaffected by the breakdown of the magnetic ground state due to either doping or increased temperature. Based on these results we propose that phonons strongly couple not to the static order, but to high frequency magnetic fluctuations.
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