Effect of pressure on optical excitations in semiconducting MBa/sub 2/Cu/sub 3/O/sub 6/ (M = Y,Sm,Gd)
Journal Article
·
· Phys. Rev. B: Condens. Matter; (United States)
We report optical reflectance measurements in the 0.5--4-eV region for ceramic samples of MBa/sub 2/Cu/sub 3/O/sub 6/ (M = Y, Sm, Gd) as a function of pressure up to 34 GPa. Two distinct optical transitions at 1.75 and 2.6 eV can be identified in the visible region. These transitions show only a weak shift with pressure (pressure coefficients dE/dP = -2 and 10 meV/GPa, respectively) or rare-earth substitution. Based on the strength of these transitions, their pressure behavior, and the observation of a similar optical response for La/sub 2/CuO/sub 4/, we assign the 1.75-eV excitation in MBa/sub 2/Cu/sub 3/O/sub 6/ as due to the O(p)-Cu(d) charge-transfer-gap in the two-dimensional Cu-O network.
- Research Organization:
- Max-Planck-Institut fuer Festkoerperforschung, D-7000 Stuttgart 80, Federal Republic of Germany
- OSTI ID:
- 7090308
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:10; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGE EXCHANGE
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
MATERIALS
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
REFLECTIVITY
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SEMICONDUCTOR MATERIALS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGE EXCHANGE
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
MATERIALS
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
REFLECTIVITY
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SEMICONDUCTOR MATERIALS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES