Anisotropy of the optical dielectric function in the ab plane for YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Sat Feb 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.2577· OSTI ID:7276290

Kotz, A L; Klein, M V; Lee, W C; Giapintzakis, J; Ginsberg, D M ^[1]; Veal, B W ^[2]

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1. Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We report ellipsometric measurements from surfaces of three single-crystal samples of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. Two of the samples were untwinned with {ital T}{sub {ital c}}=90 and 66 K. The third sample was a tetragonal single crystal with low oxygen content ({delta}{similar to}0.9). We used solutions for {var epsilon}{sup {ital c}} obtained from measurements on two faces of thick, single-crystal, twinned samples to solve for the other two components of the dielectric tensor ({var epsilon}{sup {ital a}} and {var epsilon}{sup {ital b}}). We examine anisotropy in the {ital ab} {ital plane} and observe unexplained polarization of several peaks, in the middle range of oxygen content. Most notably, we observe a {ital b}-polarized feature at 4.16 eV and an {ital a}-polarized feature at 4.59 eV for {ital T}{sub {ital c}}=66 K, which we propose to be a splitting of the 4.03-eV peak observed in the insulator.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7276290
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:5; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DIELECTRIC TENSOR
ELLIPSOMETRY
FRESNEL COEFFICIENT
HIGH-TC SUPERCONDUCTORS
MEASURING METHODS
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TENSORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES