Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa2Cu3O6.9studied by polarized neutron spectroscopy

2011/01/31 by N. S. Headings, S. M. Hayden, J. Kulda +3
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Chemistry #Condensed matter physics #Inelastic neutron scattering #Inelastic scattering #Magnetic and transport properties of perovskites and related materials #Phonon #Physics #Physics of Superconductivity and Magnetism #Polarization (electrochemistry) #Quantum mechanics #Scattering #Superconductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.84.104513

published as Phys. Rev. B 84, 104513 (2011) · Various typos and errors (inc assignment of components) corrected

arxiv created 2011/06/04 · openalex publication_date 2011/09/12 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We use inelastic neutron scattering with spin polarization analysis to study the magnetic excitations in the normal and superconducting states of YBa₂Cu₃O_6.9. Polarization analysis allows us to determine the spin polarization of the magnetic excitations and to separate them from phonon scattering. In the normal state, we find unambiguous evidence of magnetic excitations over the 10--60 meV range of the experiment with little polarization dependence to the excitations. In the superconducting state, the magnetic response is enhanced near the ``resonance energy'' and above. At lower energies, 10\ensuremath\lesssimE\ensuremath\lesssim30 meV, the local susceptibility becomes anisotropic, with the excitations polarized along the c axis being suppressed. We find evidence for a new diffuse anisotropic response polarized perpendicular to the c axis which may carry significant spectral weight.

Citations

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