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Dresden 2006 – scientific programme

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TT: Tiefe Temperaturen

TT 19: Correlated Electrons: Low-dimensional Materials

TT 19.16: Talk

Tuesday, March 28, 2006, 18:00–18:15, HSZ 301

Two-Dimensional Electron-Electron Scattering in the Inherent Conducting Polymer {(CH3)0.92ReO3} — •R. Miller1, E.–W. Scheidt1, G. Eickerling1, Ch. Helbig1, R. Herrmann1, W. Scherer1, and P. Schwab21Chemische Physik und Materialwissenschaften, Universität Augsburg, 86159 Augsburg, Germany — 2Theoretische Physik II, Universität Augsburg,

The metal-oxide system polymeric methyltrioxorhenium {(CH3)0.92 ReO3} (poly-MTO) is a unique representative of an inherent conductive organometallic polymer. In particular the {ReO2} planes characterize poly-MTO as a prototype for a purely two-dimensional system. The resistivity data of pure poly-MTO exhibit a crossover from metallic (dρ/dT > 0) to insulating (dρ/dT < 0) behavior at a characteristic temperature Tmin≅ 38 K. Above Tmin the resistivity ρ(T) is remarkably well described by a two-dimensional electron system. Below Tmin an unusual resistivity behavior, similar to that found in doped cuprates, is observed. The resistivity increases as ρ ∼ ln(1/T) before it follows a √T temperature dependence below 2 K. We suggest a crossover from purely two-dimensional charge-carrier diffusion within the {ReO2} planes to three-dimensional diffusion at low temperatures in a disorder-enhanced electron-electron interaction scenario (Altshuler-Aronov correction).

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