Spin dynamics of Er{sup 3+} in ErBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.365002· OSTI ID:496531

Skanthakumar, S; Lynn, J W ^[1]; Dogan, F ^[2]

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1. Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
2. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195 (United States)

Neutron scattering techniques are used to study the magnetic excitations of the Er ions in superconducting ErBa{sub 2}Cu{sub 3}O{sub 7}, a system where the Er ions order antiferromagnetically at {ital T{sub N}}=0.62 K and the sublattice magnetization obeys the relation for a 2D {ital 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 {ital kT{sub N}}, as expected for an Ising system. However, we also observe dispersion of the spin waves in the {ital a-b} plane. These excitations are found to renormalize with temperature and only diffuse paramagnetic scattering is observed well above the ordering temperature. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496531
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
BARIUM OXIDES
COPPER OXIDES
ERBIUM COMPOUNDS
ERBIUM OXIDES
INELASTIC SCATTERING
ISING MODEL
MAGNETIZATION
MONOCRYSTALS
NEUTRON DIFFRACTION
SPIN WAVES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE