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Titolo:
SPECIFIC-HEATS OF RARE-EARTH IONS IN CRYSTALLINE AND GLASSY PHOSPHATEMATRICES
Autore:
CARINI G; DANGELO G; TRIPODO G; BARTOLOTTA A; FONTANA A; ROSSI F; SAUNDERS GA;
Indirizzi:
UNIV MESSINA,DIPARTIMENTO FIS,CONTRADA PAPARDO SALITA SPERONE 31 I-98166 MESSINA ITALY UNIV MESSINA,IST NAZL FIS MAT I-98166 MESSINA ITALY CNR,IST TECN SPETTROSCOP I-98166 MESSINA ITALY UNIV TRENT,DIPARTIMENTO FIS I-38050 POVO TRENTO ITALY UNIV TRENT,IST NAZL FIS MAT I-38050 POVO TRENTO ITALY UNIV BATH,SCH PHYS BATH BA2 7AY AVON ENGLAND
Titolo Testata:
Philosophical magazine. B. Physics of condensed matter.Statistical mechanics, electronic, optical and magnetic
fascicolo: 2, volume: 77, anno: 1998,
pagine: 449 - 455
SICI:
1364-2812(1998)77:2<449:SORIIC>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-ENERGY EXCITATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
12
Recensione:
Indirizzi per estratti:
Citazione:
G. Carini et al., "SPECIFIC-HEATS OF RARE-EARTH IONS IN CRYSTALLINE AND GLASSY PHOSPHATEMATRICES", Philosophical magazine. B. Physics of condensed matter.Statistical mechanics, electronic, optical and magnetic, 77(2), 1998, pp. 449-455

Abstract

Measurements have been made of the low-temperature specific heats of lanthanide metaphosphate glasses R(PO3)(3) where R is Gd3+, Dy3+, Pr3+, Sm3+, EU3+ Or La3+. A magnetic contribution to the specific heat of the glasses modified by Gd3+ and Dy3+ has been found in the temperature region below 7 K. This magnetic specific heat has a T dependence consistent with the high temperature tail of a Schottky anomaly. The glass containing Pr3+ ions shows excess contributions to the specific heatand to the low-frequency Raman scattering, which are associated with a very large density of low-lying magnetic excitations. To examine theinfluence of the topological disorder in the glassy state on the magnetic contributions to the calorimetric characteristics, results are compared and contrasted with those for single-crystal PrP5O14.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 10:06:06