A Mystery in Thermoelectric Layered Cobaltites; the Correlation between Magnetism and Transport Properties on the Two-Dimensional Triangular Lattice
نویسنده
چکیده
Using muon spin spectroscopy we have found that, for both NaxCoO2 (0.6 x 0.9) and 3and 4-layer cobaltites, a common low temperature magnetic state (which in some cases is manifest as an incommensurate spin density wave) forms in the CoO2 planes. Here we summarize those results and report an almost dome-shaped relation <_ <_ between the transition temperature into the low-T magnetic state and the composition x for NaxCoO2 and/or the high-temperature asymptotic limit of thermopower in the more complex 3and 4-layer cobaltites. This behavior is explained using the Hubbard model on two-dimensional triangular lattice in the CoO2 plane.
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