Volume 40, Number 4, November II 1997
|Page(s)||435 - 440|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Low-energy magnetic excitations in the Pr metaphosphate glass
Dipartimento di Fisica and Istituto Nazionale di
Fisica della Materia, Università di Messina, Contrada Papardo,
Salita Sperone 31, I-98166, S. Agata (ME ), Italy
2 Dipartimento di Fisica and Istituto Nazionale di Fisica della Materia, Università di Trento, 38050 Povo (TN ), Italy
3 School of Physics, University of Bath, Claverton Down, Bath, UK
Accepted: 9 October 1997
Large magnetic contributions to the low-temperature specific heats of rare-earth metaphosphate glasses have been observed. These effects result from electronic transitions between 4f levels multiply split due to local disorder, which also give rise to a strong electronic contribution to the low-frequency Raman scattering at low temperatures in the Pr metaphosphate glass. By contrast Sm and Gd metaphosphate glasses show the usual spectral features for a glass: the quasielastic scattering and the boson peak. Both the thermal and optical characteristics in the Pr glass are associated with a very large density of low-lying magnetic excitations, induced by the topological disorder. Using the electronic low-frequency Raman scattering at 1.5 K, which reflects this high density of low-energy states, it has proved possible to fit the magnetic contribution to the low-temperature specific heat in the Pr glass.
PACS: 75.40.-s – Critical-point effects, specific heats, short-range order / 75.50.-y – Studies of specific magnetic materials / 78.30.-j – Infrared and Raman spectra
© EDP Sciences, 1997
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