Specific-heat Study of Low-energy Vibrational State m Vitreous Samarium Phosphates
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 predict...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia Press
1995
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| Online Access: | 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/ |
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| Summary: | 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. |
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