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http://dx.doi.org/10.4283/JMAG.2005.10.3.128

Optical Properties of Two Different Metallic NaxCoO2:x=0.35 and 0.75  

Hwang, J. (Department of Physics and Astronomy, McMaster University)
Yang, J. (The Canadian Institute of Advanced Research)
Timusk T. (Department of Physics and Astronomy, McMaster University, The Canadian Institute of Advanced Research)
Chou, F.C (Center for Materials Science and Engineering, MIT)
Publication Information
Journal of Magnetics / v.10, no.3, 2005 , pp. 128-132 More about this Journal
Abstract
We report optical ab-plane properties of the layered sodium cobaltate, $Na_xCoO_2$ for x = 0.35 and 0.75. Two samples show metallic behaviors according to dc resistivity transport. Overall temperature dependent optical conductivities of both samples are very similar to those of the high temperature superconducting underdoped cuprates. We found that the optical scattering rate of x = 0.75 sample, which is in a Curie-Weiss metallic phase, varies linearly (non-Fermi liquid) with frequency and temperature while that of x = 0.35 sample, which is in a paramagnetic metallic phase, varies quadratically (Fermi liquid) with frequency and temperature. Both x = 0.35 and 0.75 samples have an onset of scattering around $600\;cm^{-1}$ which can be attributed to the interaction of charge carriers with a bosonic collective mode in a system.
Keywords
Sodium cobaltate; Optical conductivity; Optical scattering rate; Bosonic collective mode;
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