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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 Na_xCoO₂ — •Peter Lemmens¹, Dietrich Wulferding¹, Vladimir Gnezdilov^1,2, Alexander Doering¹, Chengtian Lin³, Guo-Jun Shu⁴, and Fang-Cheng Chou⁵ — ¹IPKM, 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 Na_xCoO₂ 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.