We present a comparative study of CoO₂ layers in the Bi misfit and NaₓCoO₂ cobaltates. Co NMR measures the intrinsic susceptibility of the Co layers and is not affected by spurious contributions. At low dopings where room-temperature thermoelectric power (TEP) is large, Curie-Weiss susceptibilities are observed in both materials. But NMR and muon-spin resonance experiments find neither charge nor spin order down to low temperatures in Bi misfit cobaltates in contrast to the case of NaₓCoO₂. This demonstrates that metallicity, charge, and magnetic order are specific to the Na layers in NaₓCoO₂ whereas strong correlations are generic for cobaltate physics and could explain the large TEP.
No takes yet. Share an insight, caveat, or question.
Bobroff et al. (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: