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Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of LaFeAsO0.5D0.5
- Source :
- Physical Review B. 98
- Publication Year :
- 2018
- Publisher :
- American Physical Society (APS), 2018.
-
Abstract
- Magnetic excitations in a heavily electron-doped antiferromagnet, ${\mathrm{LaFeAsO}}_{0.5}{\mathrm{D}}_{0.5}$, have been investigated using powder inelastic neutron scattering. Unlike other parent compounds of the iron-based superconductors, the magnetic excitation gap in ${\mathrm{LaFeAsO}}_{0.5}{\mathrm{D}}_{0.5}$ was not detected down to the lowest measured temperature of 4 K. This result can be understood as a result of quasi-isotropy within the $ab$ plane, which is consistent with the band calculation result that the ${d}_{xy}$ orbital plays the dominant role in the magnetism of ${\mathrm{LaFeAsO}}_{0.5}{\mathrm{H}}_{0.5}$. In addition, the intensities of the magnetic excitations in this phase are much stronger than those in nondoped LaFeAsO. Even in the paramagnetic phase, the magnetic excitation in ${\mathrm{LaFeAsO}}_{0.5}{\mathrm{D}}_{0.5}$ persists. These results corroborate recent studies showing that the electron doping enhances the localized nature in this system.
- Subjects :
- Superconductivity
Physics
Condensed matter physics
Magnetism
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Inelastic neutron scattering
Paramagnetism
Gapless playback
Phase (matter)
0103 physical sciences
Antiferromagnetism
010306 general physics
0210 nano-technology
Excitation
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 98
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........0331ba14eadfb0d2a085a105638b0755