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

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)14027-14030
Number of pages4
JournalPhysical Review B
Volume48
Issue number18
DOIs
Publication statusPublished - 1993
Externally publishedYes

Fingerprint

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

Cite this

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

In: Physical Review B, Vol. 48, No. 18, 1993, p. 14027-14030.

Research output: Contribution to journalArticle

Shibata, H. ; Watanabe, T. ; Kinoshita, K. ; Matsuda, Azusa ; Yamada, T. / Infrared reflectivity of La1.89Ca1.11Cu2O6±δ single crystals at various O2 annealing pressures. In: Physical Review B. 1993 ; Vol. 48, No. 18. pp. 14027-14030.
@article{f7071f49fd544fb8a40630017789ef7e,
title = "Infrared reflectivity of La1.89Ca1.11Cu2O6±δ single crystals at various O2 annealing pressures",
abstract = "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.",
author = "H. Shibata and T. Watanabe and K. Kinoshita and Azusa Matsuda and T. Yamada",
year = "1993",
doi = "10.1103/PhysRevB.48.14027",
language = "English",
volume = "48",
pages = "14027--14030",
journal = "Physical Review B-Condensed Matter",
issn = "0163-1829",
publisher = "American Institute of Physics Publising LLC",
number = "18",

}

TY - JOUR

T1 - Infrared reflectivity of La1.89Ca1.11Cu2O6±δ single crystals at various O2 annealing pressures

AU - Shibata, H.

AU - Watanabe, T.

AU - Kinoshita, K.

AU - Matsuda, Azusa

AU - Yamada, T.

PY - 1993

Y1 - 1993

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0037542290&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037542290&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.48.14027

DO - 10.1103/PhysRevB.48.14027

M3 - Article

VL - 48

SP - 14027

EP - 14030

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 0163-1829

IS - 18

ER -