Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of LaFeAsO0.5D0.5
Bibliographic Information
- Other Title
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- LaFeAsO0.5D0.5の第二反強磁性母相におけるギャップレス磁気励起
- Gapless magnetic excitation in a heavily electron-doped antiferromagnetic phase of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>LaFeAsO</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">D</mml:mi><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Abstract
Magnetic excitations in a heavily electron-doped antiferromagnet, LaFeAsO$_{0.5}$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 LaFeAsO$_{0.5}$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 LaFeAsO$_{0.5}$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 LaFeAsO$_{0.5}$D$_{0.5}$ persists. These results corroborate recent studies showing that the electron doping enhances the localized nature in this system.
Journal
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- Physical Review B
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Physical Review B 98 (17), 174415_1-174415_6, 2018-11
American Physical Society (APS)
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Details 詳細情報について
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- CRID
- 1050564288768687744
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- NII Article ID
- 120006731602
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- ISSN
- 24699969
- 24699950
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- Crossref
- CiNii Articles
- KAKEN