Superconductive and normal-state transport properties of epitaxial YBa[sub 2](Cu[sub 1[minus][ital x]]Ni[sub [ital x]])[sub 3]O[sub 7] films

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.15185· OSTI ID:5430013

Speckmann, M; Kluge, T; Tome-Rosa, C; Becherer, T; Adrian, H ^[1]

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1. Institute fuer Festkoerperphysik, Technische Hochschule Darmstadt, Hochschulstrasse 8, D-6100 Darmstadt (Germany)

Ni-doped epitaxial thin YBa[sub 2](Cu[sub 1[minus][ital x]]Ni[sub [ital x]])[sub 3]O[sub 7[minus][delta]] films have been prepared by high-oxygen-pressure dc sputtering from stoichiometric targets on SrTiO[sub 3] substrates. Structural properties of these [ital c]-axis-oriented films were not affected by Ni doping up to [ital x]=15%. Inductively measured transition temperatures show a decrease with a rate of [minus]4.5 K/(at. % Ni) for Ni concentrations up to [ital x]=4%. For higher Ni contents the [ital T][sub [ital c]]-depression rate changes to [minus]1.5 K/(at. % Ni). A change in slope is also detectable in the dependence of the resistivity on Ni concentration. These results can be explained in a model based on a concentration-dependent site preference of the Ni atoms. The activation energy for vortex creep (extracted from resistive transitions) and the critical-current density show the pinning effectiveness of the dopant. Scaling laws for the pinning-force density have also been studied. The Hall concentration [ital n][sub [ital H]] shows a slight increase for small [ital x] and a decrease for higher values. The slope [ital dn][sub [ital H]]/[ital dT] is also lowered for increasing Ni content. Furthermore, the mobility and the Hall angle of the YBa[sub 2](Cu[sub 1[minus][ital x]]Ni[sub [ital x]])[sub 3]O[sub 7[minus][delta]] films were deduced from experimental data.

• OSTI ID: 5430013
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 47:22; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ELECTRIC CONDUCTIVITY
SUPERCONDUCTIVITY
TRANSPORT THEORY
CUPRATES
HIGH-TC SUPERCONDUCTORS
NICKEL OXIDES
YTTRIUM OXIDES
CRITICAL CURRENT
DOPED MATERIALS
EPITAXY
HALL EFFECT
NICKEL ADDITIONS
SCALING LAWS
STOICHIOMETRY
STRONTIUM TITANATES
SUBSTRATES
THIN FILMS
TRANSITION TEMPERATURE
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
FILMS
MATERIALS
NICKEL ALLOYS
NICKEL COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)