Numéro |
J. Phys. IV France
Volume 114, April 2004
|
|
---|---|---|
Page(s) | 363 - 365 | |
DOI | https://doi.org/10.1051/jp4:2004114084 |
J. Phys. IV France 114 (2004) 363
DOI: 10.1051/jp4:2004114084
The origin of the difference in the superconducting critical
temperatures of the
and
phases of (BEDT-TTF)
2I
3
B.J. Powell Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia
e-mail: powell@physics.uq.edu.au
Abstract
Incommensurate lattice fluctuations are present in the
phase
(
K) of ET
2I
3 (where ET is BEDT-TTF -
bis(ethylenedithio)tetrathiafulvalene) but are absent in the
phase (
K). We propose that the disorder in the
conformational degrees of freedom of the terminal ethylene groups
of the ET molecules, which is required to stabilise the lattice
fluctuations, increases the quasiparticle scattering rate and that
this leads to the observed difference in the superconducting
critical temperatures,
Tc, of the two phases. We calculate the
dependence of
Tc on the interlayer residual resistivity. Our
theory has no free parameters. Our predictions are shown to be
consistent with experiment. We describe experiments to
conclusively test our hypothesis.
© EDP Sciences 2004