Large magnetic contributions to the low-temperature specific heats of rare-earth rnetaphosphate (R2O3)0.25(P2O5) 0.75 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.

Low-energy magnetic excitations in the Pr metaphosphate glass

CARINI, Giuseppe;D'ANGELO, Giovanna;TRIPODO, Gaspare;
1997-01-01

Abstract

Large magnetic contributions to the low-temperature specific heats of rare-earth rnetaphosphate (R2O3)0.25(P2O5) 0.75 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.
1997
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11570/1835093
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