Paraconductivity measurements and comparative studies of fluctuations in BiSrCaCuO, YBaCuO and YBaCuO with Gd substitution

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5930138

Patapis, S K; Sideridis, L; Apostolopoulos, G ^[1]; Ausloos, M ^[2]; Luo, H L ^[3]; Politis, C ^[4]; Puig, T; Pont, M; Munoz, J S ^[5]

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1. Athens Univ. (Greece). Dept. of Physics
2. Liege Univ. (Belgium). Inst. de Physique
3. California Univ., San Diego, La Jolla, CA (United States). Dept. of Electrical and Computer Engineering
4. Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Nukleare Festkoerperphysik
5. Univ

Information concerning the dimensionality of the superconductive fluctuations in the new high temperature superconductors can be derived from the excess conductivity (or paraconductivity) near the transition temperature. Here the lowering'' of the sample resistance in the same temperature regions is used for extraction of dimensionality and generally for comparative studies of the critical behaviour of three different samples such as YBa{sub 2}Cu{sub 3}O{sub 7}, Y{sub 0.8}Gd{sub 0.2}Ba{sub 2}Cu{sub 3}O{sub 7} and Bi{sub 0. 85}Pb{sub 0.15}SrCa{sub 1.2}Cu{sub 2}O{sub 6}. The experimental data of the three samples show a similar behaviour with some distinct differences depending rather on the metallurgical'' state of the material than the composition itself. A logarithmic behaviour is present for YBaCuO and Y(Gd)BaCuO samples not close to the critical temperature and, the most important, closer to {Tc} YBaCuO shows a fractal behaviour, observed for the first time, similar to the one of Bi-compound observed many times before.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE; NATO; USDOE, Washington, DC (United States); North Atlantic Treaty Organization, Brussels (Belgium)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5930138
• Report Number(s): ANL/CP-75114; CONF-910860-3; ON: DE92007377
• Resource Relation: Conference: NATO Advanced Study Institute on physics and materials science of high-temperature superconductors, Corfu Island (Greece), 18-31 Aug 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
FLUCTUATIONS
SUPERCONDUCTIVITY
CALCIUM OXIDES
COPPER OXIDES
GADOLINIUM OXIDES
HIGH-TC SUPERCONDUCTORS
ELECTRIC CONDUCTIVITY
LEAD OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
COMPARATIVE EVALUATIONS
FRACTALS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
EVALUATION
GADOLINIUM COMPOUNDS
LEAD COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)