Magnetic neutron scattering resonance of high-¤Tc¤ superconductors in external magnetic fields: An SO(5) study

Asger Mortensen, Henrik Moodysson Rønnow, Henrik Bruus, Per Hedegård

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    Abstract

    The magnetic resonance at 41 meV observed in neutron scattering studies of YBa2Cu3O7 holds a key position in the understanding of high-T-c, superconductivity. Within the SO(5) model for superconductivity and antiferromagnetism, we have calculated the effect of an applied magnetic field on the neutron scattering cross section of the magnetic resonance. In the presence of Abrikosov vortices, the neutron scattering cross section shows clear signatures of not only the fluctuations in the superconducting order parameter psi, but also the modulation of the phase of psi due to vortices. In reciprocal space we find that (i) the scattering amplitude is zero at (pi/a,pi/a), (ii) the resonance peak is split into a ring with radius pi/d centered at (pi/a, pi/a), d being the vortex lattice constant, and consequently, (iii) the splitting pi/d scales with the magnetic field as root B.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume62
    Issue number13
    Pages (from-to)8703-8706
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2000

    Bibliographical note

    Copyright (2000) American Physical Society

    Keywords

    • STATES
    • MODEL
    • VORTEX
    • PEAK
    • EXCITATIONS
    • VORTICES
    • YBA2CU3O7
    • ANTIFERROMAGNETIC CORES

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