Role of point defects and their clusters for flux pinning as determined from irradiation and annealing experiments in YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] single crystals

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.4067· OSTI ID:6134306

Vlcek, B M; Viswanathan, H K ^[1]; Frischherz, M C ^[2]; Fleshler, S; Vandervoort, K; Downey, J; Welp, U; Kirk, M A; Crabtree, G W ^[1]

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1. Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60438 (United States)
2. Atominstitut der Oesterreichischen Universitaeten, Wien, Schuettelstrasze 114 (Austria)

We present measurements of the magnetization hysteresis on neutron- and proton-irradiated YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] single crystals. The crystals were irradiated to fluences of 2[times]10[sup 17] [ital n] cm[sup [minus]2] ([ital E][sub [ital n]][gt]0.1 MeV) and 1[times]10[sup 16] cm[sup [minus]2] ([ital E][sub [ital p]]=3.5 MeV), respectively. The magnetization was measured for both field directions. We observed increases of the hysteresis by a factor of 5 at 10 K and 1 T for [bold H][parallel][ital c] for the neutron-irradiated sample and a factor of 9 for the proton-irradiated sample. For [bold H][parallel][ital ab] the hysteresis increased by a factor of 8 and 6, respectively. The irradiated crystals were annealed at 100, 200, and 300 [degree]C in air for 8 h each. The irradiation-induced decrease of [ital T][sub [ital c]] is fully recovered after the final annealing step for both types of irradiation. The magnetization hysteresis for [bold H][parallel][ital ab] decreases almost to its preirradiation level after annealing at 300 [degree]C for both types of irradiation. In contrast, for [bold H][parallel][ital c], 50% of the initial neutron-irradiation- and 30% of the proton-irradiation-induced enhancements of the magnetization hysteresis are still maintained after the final annealing. The differences in annealing between neutron- and proton-irradiated samples are attributed to the different amount of point defects created by these types of irradiation.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6134306
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:6; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360206 -- Ceramics
Cermets
& Refractories-- Radiation Effects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
BARYONS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
CUPRATES
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRONS
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
IRRADIATION
MAGNETIZATION
MEV RANGE
MONOCRYSTALS
NEUTRONS
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
PROTONS
RADIATION EFFECTS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES