| タイトル | The anomalous thermal properties of glasses at low temperatures |
| 著者（英） | Salinger, G. L.; Pohl, R. O. |
| 著者所属（英） | Rensselaer Polytechnic Inst.|Cornell Univ. |
| 発行日 | 1976-10-15 |
| 言語 | eng |
| 内容記述 | While experimentally there is great regularity below 1 deg K in the behavior of a particular thermal property for all amorphous dielectrics it is not understood why these properties should differ from those of crystalline dielectrics, since it would seem that at low temperatures long-wavelength elastic waves, similar in both cases, would determine the thermal properties. A model involving systems having very few levels is used in the present study, although the relation between the model's systems and the nature of the glassy state is not known. It is shown, among other effects, that: specific heat measurements above 0.1 K indicate a distribution of local modes independent of energy; ultrasonic velocity measurements give information about phonon-local mode coupling parameters; and thermal expansion and far infrared experiments indicate a phonon-assisted tunneling model. |
| NASA分類 | NONMETALLIC MATERIALS |
| レポートNO | 77A31719 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/438242 |
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