Issue |
Europhys. Lett.
Volume 40, Number 4, November II 1997
|
|
---|---|---|
Page(s) | 435 - 440 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00484-4 | |
Published online | 01 September 2002 |
Low-energy magnetic excitations in the Pr metaphosphate glass
1
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
Received:
21
July
1997
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.