Issue |
Europhys. Lett.
Volume 38, Number 9, June III 1997
|
|
---|---|---|
Page(s) | 669 - 674 | |
Section | Condensed matter: structure, thermal and mechanical properties | |
DOI | https://doi.org/10.1209/epl/i1997-00301-2 | |
Published online | 01 September 2002 |
Evidence of a fractional Debye-Stokes-Einstein law in supercooled o-terphenyl
1
Dipartimento di Fisica, Università di Pisa - Piazza Torricelli
2, I-56126 Pisa, Italy
2
INFM, UdR Pisa - Pisa, Italy
Received:
26
March
1997
Accepted:
20
May
1997
The rotational dynamics of nearly spherical and cylindrical tracers dissolved
in supercooled o-terphenyl is studied via the Electron Spin
Resonance spectroscopy.
On decreasing the temperature, a sharp crossover is observed
from the regime where
the Debye-Stokes-Einstein law (DSE) holds to a new one which is
accounted for by a fractional DSE (FDSE) with
.
is the rotational
diffusion constant, η the shear viscosity and T the temperature.
Tumbling and spinning of the cylindrical tracer exhibit distinct
crossovers. A simple model of FDSE based on the presence of dynamic
heterogeneities is presented.
PACS: 66.30.Jt – Diffusion of impurities / 64.70.Pf – Glass transitions / 76.30.-v – Electron paramagnetic resonance and relaxation
© EDP Sciences, 1997
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