| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:19 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2007 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Study of the ground manifold of the Kramers rare earth ions in solid matrices by high field EPR spectroscopy: Nd{3+} in PbWO4 single-crystals
Authors:
F.F.Popescu(1), M.Martinelli(2), C.A.Massa(2), L.A.Pardi(2),V.Bercu(1)(3)
M.Stefan(4), S.V.Nistor(4), M. Nikl(5), P. Bohacek(5)
Affiliation:
(1)Department of Physics, University of Bucharest, Magurele,
(2)Istituto per i processi Chimico-Fisici, Consiglio Nazionale delle Ricerche (IPCF-CNR)
(3) Department of Physics, University of Pisa
(4) National Institute for Materials Physics, Bucharest
(5)Institute of Physics AS CR, Prague
E-mail
ffpopescu@k.ro
vbercu@ipcf.cnr.it
Keywords:
Kramers ions,trace impurities, Electron Paramagnetic Resonance
Abstract:
An EPR spectra investigation of Nd{3+} trace impurities in PbWO4 single-crystals was carried out at the 9.43\ GHz conventional microwave frequency and at the 95, and 190 GHz high frequencies. The spectra are well described at all frequencies by an axial spin-Hamiltonian with effective spin one-half. The g//-factor and the hyperfine parameter A// for the magnetic field along the tetragonal axis decrease with frequency increase. This is shown to be a high field effect, since at high frequencies the large Zeeman interaction is mixing some upper doublets of the ground manifold. Using a multifrequency high-field EPR analysis of the g-factors combined with available data from the optical spectra, an accurate description of the ground manifold of the Nd{3+} ions in PbWO4 could be derived.
|
|
|
|