Searching for crystallographic superstructures in [kappa]-(BEDT-TTF) sub(2Cu[N(CN)) sub(2)]Br

To resolve a superstructure formation previously reported for the organic superconductor [kappa]-(BEDT-TTF) sub(2Cu[N(CN)) sub(2)]Br, we present synchrotron x-ray diffraction experiments carried out at the MAGS beamline at BESSY, Helmholtz-Centre Berlin. Surprisingly, in our low temperature (28 K) e...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2010-06, Vol.405 (11), p.S282-S283
Main Authors: Wolter, AUB, Feyerherm, R, Dudzik, E, Suellow, S, Strack, Ch, Lang, M, Schweitzer, D, Schlueter, JA
Format: Article
Language:English
Subjects:
Condensed matter
Ethylene
Materials handling
Order disorder
Proposals
Searching
Superstructures
Thermal cycling
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Summary:To resolve a superstructure formation previously reported for the organic superconductor [kappa]-(BEDT-TTF) sub(2Cu[N(CN)) sub(2)]Br, we present synchrotron x-ray diffraction experiments carried out at the MAGS beamline at BESSY, Helmholtz-Centre Berlin. Surprisingly, in our low temperature (28 K) experiments, when searching k-space at (h 0 3.5), h=7, 8 and (h 0 0.5), h=5, 7, for none of these spots we could detect scattering intensity associated to a superstructure formation, in contradiction to previous reports. Our data suggest that details of the structural properties of [kappa]-(BEDT-TTF) sub(2Cu[N(CN)) sub(2)]Br - such as superstructure formation - sensitively depend on sample handling, e.g., cooling rates (in our case 4 K/min), or thermal cycling. A direct relationship between superstructure formation and terminal ethylene group ordering cannot be verified, disproving proposals put forth previously.
ISSN:0921-4526
DOI:10.1016/j.physb.2010.01.115