Mechanism of interaction of strain fields and two-level systems in amorphous dielectrics at low temperature

1988 ◽  
Vol 38 (12) ◽  
pp. 8431-8436 ◽  
Author(s):  
Subrata Mukherjee ◽  
S. Sengupta ◽  
A. N. Basu
Keyword(s):  
Low Temperature ◽  
Strain Fields ◽  
Two Level Systems ◽  
Mechanism Of Interaction

scholarly journals В каких случаях и почему стандартная модель туннелирующих двухуровневых систем неадекватно описывает низкотемпературную внутреннюю динамику реальных стекол

2019 ◽  
Vol 127 (7) ◽  
pp. 46
Author(s):  
Ю.Г. Вайнер
Keyword(s):  
Low Temperature ◽  
Standard Model ◽  
Single Molecule ◽  
Local Level ◽  
Spectral Dynamics ◽  
Molecular Systems ◽  
Sample Shape ◽  
The Standard Model ◽  
Two Level Systems ◽  
Fluorescent Molecules

AbstractExperiments carried out in recent years using single-molecule spectroscopy to study the low-temperature dynamics of some molecular solid-state media with a disordered internal structure made it possible to obtain new information on the dynamics of such media at the local level. In some substances, the time-dependent behavior of the majority of individual spectra of single fluorescent molecules introduced into the studied medium as a local spectral probe corresponded to the predictions of the standard model of tunneling two-level systems. In others, the behavior of most of the spectra of single molecules was more complicated, which it is difficult to describe in the framework of the standard model. This paper is devoted to the analysis of the results of studies of low-temperature spectral dynamics of single fluorescent molecules in a number of disordered molecular systems (amorphous polyisobutylene, toluene, cumene, propylene carbonate). The observed deviations from the predictions of the theory are associated with the microstructure of the systems under study and the sample shape. Possible reasons for the deviations of the observed local spectral dynamics from the predictions of the standard model of tunneling two-level systems are discussed. Inadequately.

Dielectric response of two level systems to strain fields at low temperatures

1996 ◽  
Vol 46 (S4) ◽  
pp. 2265-2266 ◽  
Author(s):  
Douglas Natelson ◽  
Sven Rogge ◽  
D. D. Osheroff
Keyword(s):  
Low Temperatures ◽  
Dielectric Response ◽  
Strain Fields ◽  
Two Level Systems

Microstructure of Zr3Al After 2 MeV Proton Bombardment

1992 ◽  
Vol 279 ◽  
Author(s):  
F. C. Chen ◽  
A. J. Ardell ◽  
D. F. Pedraza ◽  
R. A. Buhl
Keyword(s):  
Low Temperature ◽  
Dark Field ◽  
Spherically Symmetric ◽  
Long Range Order ◽  
Proton Bombardment ◽  
Strain Fields ◽  
Black Spots ◽  
Ordered Intermetallic ◽  
Higher Doses ◽  
Mev Protons

ABSTRACTThe ordered intermetallic Ll2 alloy Zr3Al was irradiated with 2 MeV protons at -124 °C to fluences up to 2 × 1015 H+/mm2 and at 250 °C to fluences up to 1 × 1015 H+/mm2. Defects with spherically symmetric strain fields were produced at both irradiation temperatures. They are of interstitial character at -124 °C and vacancy character at 250 °C. Disordering is induced at -124 °C, whereas irradiating at 250 °C initially lowers, then slightly raises, the degree of long-range order above its unirradiated value. Additional defects that appear as black spots were imaged using superlattice reflections in dark field. For the low-temperature irradiations they were seen at all doses, but were present at only the lowest close for the high-temperature irradiations. They are probably disordered zones, although some of the zones may be amorphous at the higher doses in the low-temperature irradiations.

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