Journal
PHYSICAL REVIEW B
Volume 89, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.155115
Keywords
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Funding
- Research Center Program of the Institute for Basic Science in Korea
- MSIP
- POSTECH
- Ministry of Science, ICT & Future Planning, Republic of Korea [IBS-R009-D1-2014-A00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We examined the temperature (T) evolution of the optical conductivity spectra of Sr3Ir2O7 over a wide range of 10-400 K. The system was barely insulating, exhibiting a small indirect bandgap of <= 0.1 eV. The low-energy features of the optical d-d excitation (h omega < 0.3 eV) evolved drastically, whereas such evolution was not observed for the O K-edge x-ray-absorption spectra. This suggests that the T evolution in optical spectra is not caused by a change in the bare (undressed) electronic structure, but instead presumably originates from an abundance of phonon-assisted indirect excitations. Our results showed that the low-energy excitations were dominated by phonon-absorption processeswhich involved, in particular, the optical phonons. This implies that phonon-assisted processes significantly facilitate the charge dynamics in barely insulating Sr3Ir2O7.
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