Interplay between magnetic properties and thermoelectricity in misfit and Na cobaltates

被引：34
作者：
Bobroff, J. [1 ]
Herbert, S.
Lang, G.
Mendels, P.
Pelloquin, D.
Maignan, A.
机构：
[1] Univ Paris 11, CNRS, Phys Solides Lab, UMR8502, F-91405 Orsay, France
[2] CNRS EnsiCaen, Lab CRISMAT, UMR 6508, F-14050 Caen, France
来源：
PHYSICAL REVIEW B | 2007年 / 76卷 / 10期
关键词：
D O I：
10.1103/PhysRevB.76.100407
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
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页数：4
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