Crossover temperature from tunneling to thermal activation in neutron-irradiated quartz

Autor:	D. A. Parshin, Christiane Laermans
Rok vydání:	1998
Předmět:	Condensed Matter::Materials Science Materials science Condensed matter physics Thermal Crossover Neutron Irradiation Plateau (mathematics) Quartz Quantum tunnelling Amorphous solid
Zdroj:	Physical Review B. 58:11099-11102
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.58.11099
Popis:	The low-temperature internal friction data in neutron-irradiated quartz and amorphous ${\mathrm{SiO}}_{2}$ are compared. The region of the tunneling plateau in irradiated quartz extends to much higher temperatures in comparison with amorphous ${\mathrm{SiO}}_{2}.$ It is interpreted within the soft-potential model that two-level systems in irradiated quartz have a higher crossover temperature ${T}_{c}$ from tunneling to thermal activation than in the glassy state. The characteristic energies $W$ of the particles in the double-well potentials are estimated. Their difference is ascribed to higher effective masses of the tunneling centers inside the amorphous network than in the distorted crystalline regions of irradiated quartz.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c3e584c10486d7f9111f7ad5b55318d2 https://doi.org/10.1103/physrevb.58.11099 Zobrazit plný text záznamu