Underdoped, optimally doped, and overdoped superconductors TlSr[sub 2]([ital R][sub 1[minus][ital x]]Ca[sub [ital x]])Cu[sub 2]O[sub 7[minus][delta]] ([ital R]=Lu or Tl)
- Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States) Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305 (Japan)
- Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305 (Japan)
The crystal structures of underdoped, optimally doped, and overdoped TlSr[sub 2]([ital R][sub 1[minus][ital x]]Ca[sub [ital x]])Cu[sub 2]O[sub 7[minus][delta]] ([ital R]=Lu or Tl) are refined from neutron powder-diffraction data. Carrier concentrations in this system are estimated from simple ionic consideration using the refined occupation numbers. The plot of [ital T][sub [ital c]] vs carrier concentration shows the characteristic bell-shaped dependence. The in-plane bond length Cu-O(1) is affected by only the change of carrier concentration and provides a measurement of the doping level, while the apical bond length Cu-O(2) is affected by both the change of carrier concentration and the amount of cation substitution. If we take the effect of cation substitution into account, these bond lengths change linearly'' with carrier concentration over the entire range from the underdoped, through the optimally doped, to the overdoped region.
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 7083986
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 51:1; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CALCIUM OXIDES
CRYSTAL STRUCTURE
COPPER OXIDES
LUTETIUM OXIDES
STRONTIUM OXIDES
THALLIUM OXIDES
BOND LENGTHS
HIGH-TC SUPERCONDUCTORS
NEUTRON DIFFRACTION
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
DIFFRACTION
DIMENSIONS
LENGTH
LUTETIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)