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Titolo:
EXCESS OF LOW-ENERGY EXCITATIONS IN GLASSES
Autore:
CARINI G; DANGELO G; TRIPODO G; FONTANA A; LEONARDI A; SAUNDERS GA; BRODIN A;
Indirizzi:
UNIV MESSINA,INFM,DIPARTIMENTO FIS,CONTRADA PAPARDO SALITA SPERONE 31I-98166 MESSINA ITALY UNIV TRENT,INFM,DIPARTIMENTO FIS I-38050 TRENT ITALY UNIV BATH,SCH PHYS BATH BA2 7AY AVON ENGLAND CHALMERS UNIV TECHNOL,DEPT PHYS S-41296 GOTHENBURG SWEDEN
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 13, volume: 52, anno: 1995,
pagine: 9342 - 9353
SICI:
0163-1829(1995)52:13<9342:EOLEIG>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
BORATE GLASSES; PHOSPHATE-GLASSES; RAMAN-SCATTERING; FREQUENCY; MODES; BEHAVIOR; SPECTRUM; DENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
G. Carini et al., "EXCESS OF LOW-ENERGY EXCITATIONS IN GLASSES", Physical review. B, Condensed matter, 52(13), 1995, pp. 9342-9353

Abstract

Low-frequency Raman spectra of metaphosphate glasses (Sm2O3)(x)(P2O5)(1-x), (Eu2O3)(x)(P2O5)(1-x), (Gd2O3)(x)(P2O5)(1-x), and GeO2 have been measured in a wide temperature range from T approximate to 10 K to the respective glass transition temperatures T approximate to 1000 K. Analysis of the Raman data in comparison with complementary low-temperature specific heat, and ultrasonic measurements reveals that the temperature and frequency dependences of the quasielastic scattering and boson peak, as well as anomalous low-temperature specific heat, are in qualitative agreement with the predictions of soft potential model (SPM). In the case of the spectral density of ''excess'' soft modes, whichare assumed to coexist and interact with ordinary phonons, the agreement can even be made quantitative under the restricted assumptions that the low-frequency Raman scattering reflects the total (phonon + excess) density of states, and the photon-vibration coupling constant is approximately linearly dependent upon frequency. However, neither of these assumptions are compatible with recent formulations of SPM.

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Documento generato il 25/11/20 alle ore 10:05:53