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Charge-stripe fluctuations in Nd4Ni3O8 as evidenced by optical spectroscopy
- Source :
- Physical Review B. 103
- Publication Year :
- 2021
- Publisher :
- American Physical Society (APS), 2021.
-
Abstract
- We present an investigation into the optical properties of ${\mathrm{Nd}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{8}$ at different temperatures from 300 down to 5 K over a broad frequency range. The optical conductivity at 5 K is decomposed into infrared-active phonons, a far-infrared band $\ensuremath{\alpha}$, a mid-infrared band $\ensuremath{\beta}$, and a high-energy absorption edge. By comparing the measured optical conductivity to first-principles calculations and the optical response of other nickelates, we find that ${\mathrm{Nd}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{8}$ features evident charge-stripe fluctuations. The $\ensuremath{\beta}$ band is attributed to electronic transitions between the gapped Ni-${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ bands due to fluctuating charge stripes, while the high-frequency absorption edge corresponds to the onset of transitions involving other high-energy bands. Furthermore, an analysis of the temperature-dependent optical spectral weight reveals a ${T}^{2}$ law, which is likely to originate from strong correlation effects.
- Subjects :
- Physics
Condensed matter physics
Spectral weight
Phonon
Charge (physics)
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Optical conductivity
Absorption edge
Atomic electron transition
0103 physical sciences
010306 general physics
0210 nano-technology
Spectroscopy
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 103
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........1d913e9f1034c9771f9b35f2da7960ed