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Title: Infrared reflectivity of single-crystal Bi sub 2 M m +1 Co sub m O sub y ( M =Ca,Sr,Ba; m =1,2), Bi sub 2 Sr sub 3 Fe sub 2 O sub 9. 2 , and

Abstract

The infrared reflectivity of single crystals of Bi{sub 2}{ital M{ital m}+1}Co{sub {ital m}}O{sub {ital y}} ({ital M}=Ca, Sr, Ba; {ital m}=1,2), Bi{sub 2}Sr{sub 3}Fe{sub 2}O{sub 9.2}, and Bi{sub 2}Sr{sub 2}MnO{sub 6.25} was measured at room temperature between 0.08 and 1.4 eV. A broad absorption band is observed in the mid-ir range (near 0.5 eV) in all the compounds studied, and an absorption band near 0.3 eV is observed in the insulating system. In terms of a conventional Drude-Lorentz model, the measured reflectivity and the frequency-dependent conductivity between 0.2 and 1 eV can be fitted with three broad Lorentzians and a Drude term. For the Bi{sub 2}{ital M{ital m}+1}Co{sub {ital m}}O{sub {ital y}} system, the reflectivity increases and assumes a more metallic profile as the number of Co-O layers per unit cell increases, or as the ionic radius of {ital M} increases. The apparent plasma edge of this system is about 0.3 eV, and remains unshifted for all Bi{sub 2}{ital M3}Co{sub 2}O{sub {ital y}}, as observed in the high-{ital T}{sub {ital c}} cuprates in which the carrier density is changed by doping. In addition, as observed in the high-{ital T}{sub {ital c}} cuprates, the reflectivity-frequency profile below the apparent plasma edgemore » is less curved than predicted by the Drude model. For the Bi{sub 2}{ital M{ital m}+1}Co{sub {ital m}}O{sub {ital y}} system, the intensity of the mid-ir absorption approximately scales with that of the free-carrierlike absorption.« less

Authors:
;  [1]; ;  [2];  [3]
  1. Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544 (USA)
  2. Department of Physics, Princeton University, Princeton, New Jersey 08544 (USA)
  3. Bell Communications Research, Red Bank, New Jersey 07701 (USA)
Publication Date:
OSTI Identifier:
5844968
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (USA)
Additional Journal Information:
Journal Volume: 43:4; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; REFLECTIVITY; BISMUTH OXIDES; CALCIUM OXIDES; HIGH-TC SUPERCONDUCTORS; IRON OXIDES; MANGANESE OXIDES; STRONTIUM OXIDES; INFRARED RADIATION; MEDIUM TEMPERATURE; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; ELECTROMAGNETIC RADIATION; IRON COMPOUNDS; MANGANESE COMPOUNDS; OPTICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RADIATIONS; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; SURFACE PROPERTIES; TRANSITION ELEMENT COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Watanabe, Y, Tsui, D C, Birmingham, J T, Ong, N P, and Tarascon, J M. Infrared reflectivity of single-crystal Bi sub 2 M m +1 Co sub m O sub y ( M =Ca,Sr,Ba; m =1,2), Bi sub 2 Sr sub 3 Fe sub 2 O sub 9. 2 , and. United States: N. p., 1991. Web. doi:10.1103/PhysRevB.43.3026.
Watanabe, Y, Tsui, D C, Birmingham, J T, Ong, N P, & Tarascon, J M. Infrared reflectivity of single-crystal Bi sub 2 M m +1 Co sub m O sub y ( M =Ca,Sr,Ba; m =1,2), Bi sub 2 Sr sub 3 Fe sub 2 O sub 9. 2 , and. United States. https://doi.org/10.1103/PhysRevB.43.3026
Watanabe, Y, Tsui, D C, Birmingham, J T, Ong, N P, and Tarascon, J M. 1991. "Infrared reflectivity of single-crystal Bi sub 2 M m +1 Co sub m O sub y ( M =Ca,Sr,Ba; m =1,2), Bi sub 2 Sr sub 3 Fe sub 2 O sub 9. 2 , and". United States. https://doi.org/10.1103/PhysRevB.43.3026.
@article{osti_5844968,
title = {Infrared reflectivity of single-crystal Bi sub 2 M m +1 Co sub m O sub y ( M =Ca,Sr,Ba; m =1,2), Bi sub 2 Sr sub 3 Fe sub 2 O sub 9. 2 , and},
author = {Watanabe, Y and Tsui, D C and Birmingham, J T and Ong, N P and Tarascon, J M},
abstractNote = {The infrared reflectivity of single crystals of Bi{sub 2}{ital M{ital m}+1}Co{sub {ital m}}O{sub {ital y}} ({ital M}=Ca, Sr, Ba; {ital m}=1,2), Bi{sub 2}Sr{sub 3}Fe{sub 2}O{sub 9.2}, and Bi{sub 2}Sr{sub 2}MnO{sub 6.25} was measured at room temperature between 0.08 and 1.4 eV. A broad absorption band is observed in the mid-ir range (near 0.5 eV) in all the compounds studied, and an absorption band near 0.3 eV is observed in the insulating system. In terms of a conventional Drude-Lorentz model, the measured reflectivity and the frequency-dependent conductivity between 0.2 and 1 eV can be fitted with three broad Lorentzians and a Drude term. For the Bi{sub 2}{ital M{ital m}+1}Co{sub {ital m}}O{sub {ital y}} system, the reflectivity increases and assumes a more metallic profile as the number of Co-O layers per unit cell increases, or as the ionic radius of {ital M} increases. The apparent plasma edge of this system is about 0.3 eV, and remains unshifted for all Bi{sub 2}{ital M3}Co{sub 2}O{sub {ital y}}, as observed in the high-{ital T}{sub {ital c}} cuprates in which the carrier density is changed by doping. In addition, as observed in the high-{ital T}{sub {ital c}} cuprates, the reflectivity-frequency profile below the apparent plasma edge is less curved than predicted by the Drude model. For the Bi{sub 2}{ital M{ital m}+1}Co{sub {ital m}}O{sub {ital y}} system, the intensity of the mid-ir absorption approximately scales with that of the free-carrierlike absorption.},
doi = {10.1103/PhysRevB.43.3026},
url = {https://www.osti.gov/biblio/5844968}, journal = {Physical Review, B: Condensed Matter; (USA)},
issn = {0163-1829},
number = ,
volume = 43:4,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 1991},
month = {Fri Feb 01 00:00:00 EST 1991}
}