Absence of circular dichroism in high-temperature superconductors

Journal Article · Sun Aug 30 20:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.1439· OSTI ID:7030610

Lawrence, T W; Szoeke, A; Laughlin, R B ^[1]

---

1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States) Department of Physics, Stanford University, Stanford, California 94305 (United States)

We have repeated and improved upon the experiment of Lyons {ital et} {ital al}., in which the observation of circular dichroism in high-{ital T}{sub {ital c}} superconductors was reported. We found a simple extension to the previous technique which makes the apparatus {ital exclusively} sensitive to {ital T}-violating circular dichroism. We find no evidence for a temperature-dependent signal in all YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} samples studied. We establish sensitivity of the apparatus to surface roughness and ascribe the previously observed signal to possible surface contamination.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7030610
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:9; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANYONS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CONTAMINATION
COPPER COMPOUNDS
COPPER OXIDES
DICHROISM
HIGH-TC SUPERCONDUCTORS
INVARIANCE PRINCIPLES
MAGNETIC CIRCULAR DICHROISM
MIXED STATE
OXIDES
OXYGEN COMPOUNDS
QUASI PARTICLES
ROUGHNESS
SUPERCONDUCTORS
SURFACE CONTAMINATION
SURFACE PROPERTIES
SYMMETRY BREAKING
T INVARIANCE
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES