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Titolo:
LOW-ENERGY MAGNETIC EXCITATIONS IN THE PR METAPHOSPHATE GLASS
Autore:
CARINI G; DANGELO G; TRIPODO G; FONTANA A; ROSSI F; SAUNDERS GA;
Indirizzi:
UNIV MESSINA,DIPARTIMENTO FIS,SALITA SPERONE 31 I-98166 SANT AGATA MEITALY UNIV MESSINA,IST NAZL FIS MAT I-98166 SANT AGATA ME ITALY UNIV TRENT,DIPARTIMENTO FIS I-38050 POVO TN ITALY UNIV TRENT,IST NAZL FIS MAT I-38050 POVO TN ITALY UNIV BATH,SCH PHYS BATH BA2 7AY AVON ENGLAND
Titolo Testata:
Europhysics letters
fascicolo: 4, volume: 40, anno: 1997,
pagine: 435 - 440
SICI:
0295-5075(1997)40:4<435:LMEITP>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOSPHATE-GLASSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
G. Carini et al., "LOW-ENERGY MAGNETIC EXCITATIONS IN THE PR METAPHOSPHATE GLASS", Europhysics letters, 40(4), 1997, pp. 435-440

Abstract

Large magnetic contributions to the low-temperature specific heats ofrare-earth metaphosphate (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 1.5K, 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.

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Documento generato il 25/11/20 alle ore 10:22:23