Infrared reflectivity of La1.89Ca1.11Cu2O6±δ single crystals at various O2 annealing pressures

H. Shibata, T. Watanabe, K. Kinoshita, Azusa Matsuda, T. Yamada

研究成果: Article

7 引用 (Scopus)

抄録

The ab-plane reflectivity of La1.89Ca1.11Cu2O6±δ single crystals, whose properties change from semiconductor to superconductor under high-oxygen-pressure annealing, is measured between 250 and 20 000 cm-1 at room temperature. Although the annealing increases the oxygen content very slightly, the spectra change in the same way as seen in other cuprates with carrier doping: a charge-transfer peak disappears and low-energy excitation increases. We suggest the possibility that holes in the apex oxygen redistribute to the CuO2 planes. Mid-infrared absorption is observed in all samples. Relation between the mid-infrared absorption and the influence of La and Ca disorder on the CuO2 planes is also discussed.

元の言語English
ページ(範囲)14027-14030
ページ数4
ジャーナルPhysical Review B
48
発行部数18
DOI
出版物ステータスPublished - 1993
外部発表Yes

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infrared absorption
Infrared absorption
Single crystals
Annealing
Oxygen
Infrared radiation
reflectance
high pressure oxygen
annealing
single crystals
oxygen
cuprates
apexes
Excitation energy
charge transfer
disorders
Superconducting materials
Charge transfer
room temperature
Doping (additives)

ASJC Scopus subject areas

  • Condensed Matter Physics

これを引用

Infrared reflectivity of La1.89Ca1.11Cu2O6±δ single crystals at various O2 annealing pressures. / Shibata, H.; Watanabe, T.; Kinoshita, K.; Matsuda, Azusa; Yamada, T.

:: Physical Review B, 巻 48, 番号 18, 1993, p. 14027-14030.

研究成果: Article

Shibata, H. ; Watanabe, T. ; Kinoshita, K. ; Matsuda, Azusa ; Yamada, T. / Infrared reflectivity of La1.89Ca1.11Cu2O6±δ single crystals at various O2 annealing pressures. :: Physical Review B. 1993 ; 巻 48, 番号 18. pp. 14027-14030.
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