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要旨:
The single-layer perovskite cobaltates have attracted enormous attention
due to the recent observation of hour-glass shaped magnetic excitation
spectra which resemble the ones of the famous high-temperature
superconducting cuprates. Here, we present an overview of our most
recent studies of the spin and charge correlations in floating-zone
grown cobaltate single crystals. We find that frustration and a novel
kind of electronic and magnetic nano phase separation are intimately
connected to the appearance of the hour-glass shaped spin excitation
spectra. We also point out the difference between nano phase separation
and conventional phase separation.
