Specific-heat Study of Low-energy Vibrational State m Vitreous Samarium Phosphates

• المؤلفون الرئيسيون: Hassan, Senin, Abd. Aziz, Sidek, G. A., Saunders, G., Carini
• التنسيق: مقال
• اللغة: English; English
• منشور في: Universiti Putra Malaysia Press 1995
• الوصول للمادة أونلاين: http://psasir.upm.edu.my/id/eprint/3855/1/Specific-heat_Study_of_Low-energy_Vibrational_State_m.pdf; http://psasir.upm.edu.my/id/eprint/3855/

Measurements of specific heat in the temperature range 1.5K to 30K were made for two samples of vitreous samarium phosphates. A large contribution to the specific heat, well above what is expected from acoustic phonons (in the Debye approximation), is discussed in terms of the theoretical predictions of a phonon-fracton cross-over approach. The phonon-fracton density of states used to fit the excess specific heat gives rise to model parameters with the same magnitudes as those found previously for a wide range of glasses.