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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)

Journal Article · · Physical Review, B: Condensed Matter; (United States)
 [1]; ; ;  [2]; ; ;  [3]
  1. 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)
  2. Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305 (Japan)
+ Show Author Affiliations
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-31109-ENG-38
OSTI ID:
7083986
Journal Information:
Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:1; ISSN PRBMDO; ISSN 0163-1829
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BOND LENGTHS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
DIMENSIONS
HIGH-TC SUPERCONDUCTORS
LENGTH
LUTETIUM COMPOUNDS
LUTETIUM OXIDES
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE