Spin Dynamics of Er³⁺ in ErBa₂Cu₃O_7-δ

Author

Suntharalingam Skanthakumar
Jeffrey W. Lynn
Fatih Dogan, Missouri University of Science and TechnologyFollow

Abstract

Neutron scattering techniques are used to study the magnetic excitations of the Er ions in superconducting ErBa₂Cu₃O₇, a system where the Er ions order antiferromagnetically at T_N=0.62 K and the sublattice magnetization obeys the relation for a 2D S=1/2 Ising model. Our data, which were taken on a cold neutron triple axis spectrometer using a horizontally focusing analyzer, reveal that there is a large gap of about 0.20 meV in the excitation spectrum, about four times the thermal energy kT_N, as expected for an Ising system. However, we also observe dispersion of the spin waves in the a-b plane. These excitations are found to renormalize with temperature and only diffuse paramagnetic scattering is observed well above the ordering temperature.

Recommended Citation

S. Skanthakumar et al., "Spin Dynamics of Er³⁺ in ErBa₂Cu₃O_7-δ," Journal of Applied Physics, vol. 81, no. 8 PART 2B, pp. 4934 - 4936, American Institute of Physics (AIP), Apr 1997.

The definitive version is available at https://doi.org/10.1063/1.365002

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0021-8979

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 1997 American Institute of Physics (AIP), All rights reserved.

Publication Date

01 Apr 1997