The influence of pressure-dependent variation of the elastic constants on tunnelling systems in amorphous solids
| Autor: | Th. Eggert, M. Jäckel, R. Geilenkeuser |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Hydrostatic pressure Thermodynamics Pressure dependent Dielectric Condensed Matter Physics Electronic Optical and Magnetic Materials Amorphous solid chemistry.chemical_compound Thermal conductivity chemistry visual_art visual_art.visual_art_medium Polystyrene Electrical and Electronic Engineering Polycarbonate Quantum tunnelling |
| Zdroj: | Physica B: Condensed Matter. :1137-1138 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(99)02536-3 |
| Popis: | We have measured the dielectric response e(ω) and the thermal conductivity κ of polystyrene (PS) and of polycarbonate (PC) under high hydrostatic pressure (0.1 MPa MPa ) and at low temperatures ( 50 mK K ). The investigations show a pressure influence on the minimum temperature of Δe′/e′ and on κ. With the pressure dependence of the density and sound velocity of PC and PS the influence of pressure on the tunnelling constant Ci can be determined. These results show that the product P γ l,t 2 of the standard tunnelling model (STM) scales with the pressure-dependent elastic constants c11 and c44. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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