LOW-ENERGY MODES IN PHOSPHATE-GLASSES - A COMPARISON WITH THE SOFT POTENTIAL MODEL

被引:44
作者
BRODIN, A
FONTANA, A
BORJESSON, L
CARINI, G
TORELL, LM
机构
[1] UNIV TRENT,DIPARTIMENTO FIS,I-38050 TRENT,ITALY
[2] ROYAL INST TECHNOL,DEPT PHYS,S-10044 STOCKHOLM,SWEDEN
[3] UNIV MESSINA,DIPARTIMENTO FIS,I-98010 SANT AGATA,ITALY
关键词
D O I
10.1103/PhysRevLett.73.2067
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Low-frequency Raman spectra of samarium phosphate glasses (Sm2O3)(x)(P2O5)(1-x) Obtained over a wide temperature range 11-973 K, were compared with those of low-temperature specific heat. The temperature and frequency dependencies of the quasielastic scattering and boson peak, as well as the anomalous specific heat, agree qualitatively with predictions of the soft potential (SP) model. The ''excess'' spectral density may also be consistent with SP predictions, assuming (1) comparatively high phonon spectral density, and (2) approximately linear in frequency light-soft mode coupling. However, these assumptions are in conflict with recent formulations of the theory.
引用
收藏
页码:2067 / 2070
页数:4
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