scholarly journals Prethermalization in a classical phonon field: Slow relaxation of the number of phonons

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
François Huveneers ◽  
Jani Lukkarinen
Keyword(s):  
Slow Relaxation ◽  
Phonon Field

PHASE TRANSFORMATION AND SLOW RELAXATION IN FLUOSILICATES

1976 ◽  
Vol 37 (C6) ◽  
pp. C6-481-C6-481
Author(s):  
J. CHAPPERT ◽  
G. JEHANNO ◽  
F. VARRET
Keyword(s):  
Phase Transformation ◽  
Slow Relaxation

scholarly journals New Radical Cation Salts Based on BDH-TTP Donor: Two Stable Molecular Metals with a Magnetic [ReF6]2− Anion and a Semiconductor with a [ReO4]− Anion

2021 ◽  
Vol 7 (4) ◽  
pp. 54
Author(s):  
Nataliya D. Kushch ◽  
Gennady V. Shilov ◽  
Lev I. Buravov ◽  
Eduard B. Yagubskii ◽  
Vladimir N. Zverev ◽  
...  
Keyword(s):  
Radical Cation ◽  
Low Temperatures ◽  
Ac Susceptibility ◽  
Slow Relaxation ◽  
Organic Radical ◽  
Inorganic Anion ◽  
Distinctive Features ◽  
Metallic Character ◽  
Radical Cation Salts ◽  
Partial Population

Three radical cation salts of BDH-TTP with the paramagnetic [ReF6]2− and diamagnetic [ReO4]− anions have been synthesized: κ-(BDH-TTP)4ReF6 (1), κ-(BDH-TTP)4ReF6·4.8H2O (2) and pseudo-κ″-(BDH-TTP)3(ReO4)2 (3). The crystal and band structures, as well as the conducting properties of the salts, have been studied. The structures of the three salts are layered and characterized by alternating κ-(1, 2) and κ″-(3) type organic radical cation layers with inorganic anion sheets. Similar to other κ-salts, the conducting layers in the crystals of 1 and 2 are formed by BDH-TTP dimers. The partial population of positions of Re atoms and disorder in the anionic layers of 1–3 are their distinctive features. Compounds 1 and 2 show the metallic character of conductivity down to low temperatures, while 3 is a semiconductor. The ac susceptibility of crystals 1 was investigated in order to test the possible slow relaxation of magnetization associated with the [ReF6]2− anion.

scholarly journals Derivation of the Landau–Pekar Equations in a Many-Body Mean-Field Limit

2021 ◽  
Vol 240 (1) ◽  
pp. 383-417
Author(s):  
Nikolai Leopold ◽  
David Mitrouskas ◽  
Robert Seiringer
Keyword(s):  
Mean Field ◽  
Einstein Condensate ◽  
Back Reaction ◽  
Many Body ◽  
Field Limit ◽  
Mean Field Limit ◽  
Phonon Field ◽  
Bose Einstein Condensate ◽  
Weakly Couple ◽  
Bose Einstein

AbstractWe consider the Fröhlich Hamiltonian in a mean-field limit where many bosonic particles weakly couple to the quantized phonon field. For large particle numbers and a suitably small coupling, we show that the dynamics of the system is approximately described by the Landau–Pekar equations. These describe a Bose–Einstein condensate interacting with a classical polarization field, whose dynamics is effected by the condensate, i.e., the back-reaction of the phonons that are created by the particles during the time evolution is of leading order.

The effect of the local pH in the slow relaxation of polyaniline

1996 ◽  
Vol 78 (2) ◽  
pp. 131-135 ◽  
Author(s):  
K. Fraoua ◽  
M. Delamar ◽  
C.P. Andrieux
Keyword(s):  
Slow Relaxation ◽  
Local Ph

Investigation of Polymer Relaxation after Deformation by Positron Annihilation

1992 ◽  
Vol 247 ◽  
Author(s):  
Sergey A. Tishin ◽  
Mihail I. Tsapovestsky ◽  
Vladimir A. Tishin ◽  
Vladimir N. Kestelman
Keyword(s):  
Positron Annihilation ◽  
Angular Correlation ◽  
Life Time ◽  
Slow Relaxation ◽  
Dielectric Losses ◽  
Free Film ◽  
Axial Tension ◽  
Polymer Relaxation ◽  
Sample Density ◽  
Nonmonotonic Change

ABSTRACTThe relaxation of polyimid films after the axial tension has been investigated by measuring life-time of positrons and angular correlation of annihilation photons. The nonmonotonic change of mean life-time while relaxing the free film has been found. Two range of changes of positron-sensitive properties can be seen: “rapid” relaxation for 4–5 hours (characterized by reducing life-time of short-lived component) and “slow” relaxation (characterized by reducing the intensity of long-lived component). The results of this investigation have been compared with those of measuring of sample density and dielectric losses. The possible explanations and the- changes of mechanizms of relaxation with the conditions of deformation and “the rest” of polymers are analyzed.

scholarly journals Generic slow relaxation in a stochastic sandpile

2003 ◽  
Vol 61 (3) ◽  
pp. 294-300 ◽  
Author(s):  
R Dickman
Keyword(s):  
Slow Relaxation
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