Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Correlated Electrons: Quantum-Critical Phenomena 1

TT 17.7: Vortrag

Dienstag, 24. März 2009, 15:45–16:00, HSZ 03

Novel coupled spin-electron liquid in the layered cobaltate NaxCoO2 — •Peter Lemmens1, Dietrich Wulferding1, Vladimir Gnezdilov1,2, Alexander Doering1, Chengtian Lin3, Guo-Jun Shu4, and Fang-Cheng Chou51IPKM, TU Braunschweig, Germany — 2ILTP, Kharkov, Ukraine — 3MPI-FKF, Stuttgart, Germany — 4Center for Condensed Matter Sciences, Taipei, Taiwan — 5Nat. Synchrotron Radiation Research Center, HsinChu, Taiwan

In the layered cobaltate NaxCoO2 certain compositions (x=0.71) show a depression of long range magnetic ordering and a coexistence of itinerant and localized charge carriers with a comparably high conductivity and a Curie-Weiss like magnetic susceptibility. In Raman scattering a divergence of quasi-elastic fluctuations is observed towards low temperatures supporting a scenario of a novel coupled spin-electron liquid state. Work supported by DFG and ESF-HFM.

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