TY - JOUR

T1 - Optical spectroscopy of the charge-ordering transition

AU - Katsufuji, T.

AU - Tanabe, T.

AU - Ishikawa, T.

AU - Fukuda, Y.

AU - Arima, T.

AU - Tokura, Y.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - Optical spectra of a single crystal of (Formula presented)(Formula presented)(Formula presented), which undergoes a charge-ordering transition at (Formula presented)∼240 K, have been investigated for wide ranges of photon energy (0.008-3 eV) and temperature (10-480 K). The opening of a charge gap as well as change of the gap magnitude (2Δ) with temperature is clearly observed below (Formula presented), with an anomalously large ratio of 2Δ(T=0)/(Formula presented)(Formula presented) (∼13). Conspicuous spectral change with temperature is also observed above (Formula presented) over the energy region up to 2 eV, which suggests persistent fluctuation of the charge ordering or formation of small polarons above (Formula presented).

AB - Optical spectra of a single crystal of (Formula presented)(Formula presented)(Formula presented), which undergoes a charge-ordering transition at (Formula presented)∼240 K, have been investigated for wide ranges of photon energy (0.008-3 eV) and temperature (10-480 K). The opening of a charge gap as well as change of the gap magnitude (2Δ) with temperature is clearly observed below (Formula presented), with an anomalously large ratio of 2Δ(T=0)/(Formula presented)(Formula presented) (∼13). Conspicuous spectral change with temperature is also observed above (Formula presented) over the energy region up to 2 eV, which suggests persistent fluctuation of the charge ordering or formation of small polarons above (Formula presented).

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U2 - 10.1103/PhysRevB.54.R14230

DO - 10.1103/PhysRevB.54.R14230

M3 - Article

AN - SCOPUS:0000578605

VL - 54

SP - R14230-R14233

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 20

ER -