How to optimize high-T[sub c] superconductive cuprates

Journal Article · Mon Jun 01 00:00:00 EDT 1992 · Journal of Superconductivity; (United States)

DOI:https://doi.org/10.1007/BF00617621· OSTI ID:7205486

Raveau, B; Michel, C; Hervieu, M; Groult, D; Maignan, A; Provost, J ^[1]

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1. Universite de Caen (France)

Different ways to optimize T[sub c]'s and the magnetic properties of high-T[sub c] superconductive cuprates are described and discussed. Oxygen intercalation-desintercalation phenomena and cationic substitutions (M[sup 3+] for M[sup 2+] or vice versa) lead to a variation of the hole carrier density and can have a drastic influence on T[sub c]'s, as shown for bismuth, thallium, and lead-based cuprates, as well as for La[sub 2]CuO[sub 4] and [open quotes]123[close quotes]-type superconductors. In the former, the role of hole reservoirs for the rock salt type layers is outlined. The modification of the hybridization of orbitals can also explain the variations of T[sub c]'s observed in some systems like Y[sub 1[minus]x]Ca[sub x]Ba[sub 2]Cu[sub 3[minus]x]Fe[sub x]O[sub 7] in which the oxidation state of copper remains constant. A critical current density enhancement can be realized by irradiating high-T[sub c] materials by high-energy heavy ions because of the peculiar columnar structure of the heavy ion-induced tracks. The effects of such columnar defects, 70 [angstrom] in diameter, on flux pinning, magnetic relaxation, and location of the irreversibility line of bismuth-based 2212 crystals irradiated by 6-GeV Pb ions are reported. We observe a strong shift of the irreversibility line toward high fields and temperatures, indicating that pinning effects must be taken into account in the vortex lattice motion. Such induced changes are accompanied by a strong enhancement of the critical current density and a significant enlargement of the irreversibility region in the H,T plane. 59 refs., 17 figs., 4 tabs.

• OSTI ID: 7205486
• Journal Information: Journal of Superconductivity; (United States), Vol. 5:3, Issue 3; ISSN 0896-1107
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER COMPOUNDS
OXIDATION
CUPRATES
SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
ELECTRONIC STRUCTURE
MAGNETIC PROPERTIES
OPTIMIZATION
RADIATION EFFECTS
TRANSITION TEMPERATURE
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CARRIER DENSITY
CLATHRATES
CRITICAL CURRENT
CRYSTAL DEFECTS
CURRENT DENSITY
EXPERIMENTAL DATA
HEAVY IONS
HOLES
HYBRIDIZATION
ION BEAMS
IRON COMPOUNDS
IRREVERSIBLE PROCESSES
LANTHANUM COMPOUNDS
LATTICE VIBRATIONS
LEAD COMPOUNDS
MAGNETIC FLUX
RELAXATION
THALLIUM COMPOUNDS
YTTRIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BEAMS
CHARGED PARTICLES
CHEMICAL REACTIONS
CRYSTAL STRUCTURE
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
INFORMATION
IONS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
665410 - Superconductivity- (1992-)