Optical properties of cuprate superconductors influenced by a magnetic field
- Dortmund Univ. (Germany). Inst. fuer Physik
This paper reports that reflection measurements on a one-domain single crystal of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and transmission measurements on single crystals of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} show a state of spontaneously broken symmetry below certain transition temperatures T{sub s} somewhat above the respective superconduction temperature T{sub c}. In both materials the sign of the effect can be controlled by an external magnetic field. In transmission measurements on films of YBa{sub 2}Cu{sub 3}I{sub 7{minus}{delta}} near T{sub s} a remanent circular dichroism is observed after applying an external magnetic field. Furthermore, the films show a Curie-Weiss type increase of magnetic circular dichroism near T{sub s}. The magnetic field effects are considered as evidence for a state with broken time reversal symmetry below T{sub s}.
- OSTI ID:
- 5277274
- Journal Information:
- International Journal of Modern Physics B; (United States), Journal Name: International Journal of Modern Physics B; (United States) Vol. 5:10; ISSN 0217-9792; ISSN IJPBE
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
COPPER COMPOUNDS
CRYSTALS
CUPRATES
CURIE-WEISS LAW
FILMS
HIGH-TC SUPERCONDUCTORS
INVARIANCE PRINCIPLES
MAGNETIC FIELDS
MAGNETO-OPTICAL EFFECTS
MONOCRYSTALS
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFLECTION
STRONTIUM COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
SYMMETRY BREAKING
T INVARIANCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS