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Author Rendell, J. M. ♦ Carbotte, J. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ BARIUM OXIDES ♦ MAGNETIC PROPERTIES ♦ COPPER OXIDES ♦ HIGH-TC SUPERCONDUCTORS ♦ YTTRIUM OXIDES ♦ ANISOTROPY ♦ CRYSTAL STRUCTURE ♦ D WAVES ♦ ENERGY GAP ♦ NEUTRON DIFFRACTION ♦ ORTHORHOMBIC LATTICES ♦ S WAVES ♦ TETRAGONAL LATTICES
Abstract YBa{sub 2}Cu{sub 3}O{sub 7} has orthorhombic symmetry because of the chains. The superconducting energy gap, which would have pure {ital d}{sub {ital x}{sup 2}{minus}{ital y}{sup 2}} symmetry in the tetragonal case, is expected to also contain a small {ital s}{sub {ital x}{sup 2}+{ital y}{sup 2}} component in the orthorhombic case. This admixture shifts the gap nodes off the main diagonals and leads to a momentum space anisotropy in the spin dynamics. Recent neutron scattering results on the 41 meV peak in twinned crystals of YBa{sub 2}Cu{sub 3}O{sub 7} are consistent with our results. Extension to untwinned crystals might be used to determine the amount of {ital s}-wave admixture although the interpretation is complicated by band anisotropy.
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-04-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 13


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