Small-angle neutron scattering study of the flux-line lattice in a single crystal of Bi[sub 2. 15]Sr[sub 1. 95]CaCu[sub 2]O[sub 8+[ital x]] (invited)

Journal Article · Tue Nov 15 00:00:00 EST 1994 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.358128· OSTI ID:6909599

Yethiraj, M; Mook, H A ^[1]; Forgan, E M; Cubitt, R; Wylie, M T ^[2]; Paul, D M ^[3]; Lee, S L ^[4]; Ricketts, J ^[5]; Kes, P H ^[6]; Mortensen, K ^[7]

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1. Oak Ridge National Laboratory, Solid State Division, MS 6393, Oak Ridge, Tennessee 37831-6393 (United States)
2. School of Physics and Space Research, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom)
3. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
4. Physk-Institut der Universitaet Zuerich, CH-8057 Zuerich (Switzerland)
5. Superconductivity Research Laboratory, ISTEC (Japan)
6. Kammerlingh Onnes Laboratorium, Leiden University, P.O. Box 9506, 2300 RA, Leiden (Netherlands)
7. Physics Department, Riso National Laboratory, DK-4000, Roskilde (Denmark)

A flux-line lattice (FLL) was observed in a single crystal of Bi[sub 2.15]Sr[sub 1.95]CaCu[sub 2]O[sub 8+[ital x]] (BSCCO) using small-angle neutron scattering methods. The sample has a superconducting transition at 85 K. The flux-line lattice is observed to melt, evidenced by the rapid disappearance of diffracted intensity as the temperature is increased above a field-dependent melting temperature. Diffracted intensity due to the vortex lattice also falls off as the applied field is increased. It is believed that this is a manifestation of the transition of the three-dimensional flux lines into two-dimensional pancake vortices. The Bragg intensity of the FLL peak is inversely proportional to the fourth power of the London penetration depth ([lambda][sub [ital L]]). Hence, the temperature ([ital T]) dependence of the order parameter can be measured quite accurately from the intensity of the Bragg spots at different temperatures. In BSCCO with an applied field of 50 mT, the measured [ital T] dependence appears linear. The low-[ital T] behavior is of great interest for an understanding of the underlying mechanism for superconductivity in these materials.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6909599
• Journal Information: Journal of Applied Physics; (United States), Vol. 76:10; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
MAGNETIC FLUX
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
HIGH-TC SUPERCONDUCTORS
MONOCRYSTALS
NEUTRON BEAMS
SMALL ANGLE SCATTERING
TEMPERATURE DEPENDENCE
ALKALINE EARTH METAL COMPOUNDS
BEAMS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
NUCLEON BEAMS
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
SCATTERING
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)