Anisotropy in magnetic dynamics of YBa{sub 2}Cu{sub 3}O{sub 7}

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.8698· OSTI ID:279818

Rendell, J M; Carbotte, J P ^[1]

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1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S 4M1 (CANADA)

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.

• OSTI ID: 279818
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANISOTROPY
BARIUM OXIDES
COPPER OXIDES
CRYSTAL STRUCTURE
D WAVES
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
S WAVES
TETRAGONAL LATTICES
YTTRIUM OXIDES