Eur. Phys. J. B 24, 143-147 (2001)
https://doi.org/10.1007/s100510170001

EPR study of Dy³⁺ ions in DyBa₂Cu₃O_6+x

¹ Department of Applied Mathematics and Physics, National Technical University, 157 80 Athens, Greece
² Solid State Section, Department of Physics, University of Athens, 157 84 Zografos, Panepistimiopolis, Athens, Greece
³ Institute of Physics, Technical University of Szczecin, Al. Piastow 17, 70 310 Szczecin, Poland

Corresponding author: ^a typjan@arcadia.tuniv.szczecin.pl

Received: 3 June 2001
Published online: 15 November 2001

Abstract

Concentrated polycrystalline DyBa₂Cu₃O_6+x compounds are studied by X-band EPR spectroscopy. A broad resonance line due to the highly anisotropic EPR spectrum of Dy³⁺ ions is identified on several specimens at low temperatures. Powder simulation of the EPR spectra complies with the ground Kramers doublet predicted by crystal field analysis of Dy³⁺ ions. Calculations of the second and fourth moments of the resonance lines due to the dipole-dipole interactions of Dy³⁺ indicate the presence of substantial exchange narrowing of the dipolar-broadened EPR linewidth.