Eur. Phys. J. B 28, 277-282 (2002)
https://doi.org/10.1140/epjb/e2002-00230-x

Electron paramagnetic resonance and magnetic susceptibility of rare-earth hydrazone compounds

¹ Department of Physics, University of Athens, 157 84 Panepistimiopolis, Athens, Greece
² Department of Physics, National Technical University, 157 80 Athens, Greece
³ Institute of Physics, Technical University of Szczecin, Al. Piastow 17, 70 310 Szczecin, Poland
⁴ Department of Chemistry, Aristotle University, 54006 Thessaloniki, Greece
⁵ Department of Physics, Temple University, Philadelphia, PA 19122, USA

Corresponding author: ^a likodimo@gel.demokritos.gr

Received: 29 April 2002
Published online: 31 July 2002

Abstract

The magnetic properties of the rare earth molecular compounds with hydrazone ligands containing Nd³⁺, Gd³⁺, and Yb³⁺ have been investigated by electron paramagnetic resonance (EPR) and magnetization measurements. For the Gd-compound, partially resolved fine structure due to Gd³⁺ and exchange narrowing effects at low temperatures are observed in the EPR spectra, suggesting, consistent with the EPR and dc magnetic susceptibility, weak antiferromagnetic exchange interactions. Paramagnetic behavior sustained down to low temperatures is derived for Yb³⁺ ions, whereas substantial ferromagnetic exchange coupling is inferred for the lighter Nd³⁺ ions, indicating significant variations of the exchange integrals along the lanthanide series.