Phys. Rev. B 76, 033105 (2007) [4 pages]Infrared Hall conductivity of Na0.7CoO2Received 4 December 2006; revised 5 March 2007; published 26 July 2007 We report the infrared Hall conductivity σxy(ω) of Na0.7CoO2 thin films at ω=1100 cm−1 determined from Faraday rotation θF measurements. σxy(ω) exhibits two types of hole conduction, Drude and incoherent carriers. The coherent Drude carriers appear at low temperatures and show a large renormalized mass and Fermi-liquid-like behavior of Hall scattering rate, γH∼aT2. The spectral weight is suppressed with increasing temperature and disappears at T=120 K. The incoherent carrier response is centered at mid-IR frequency and shifts to lower energy with increasing T. The infrared Hall constant is positive and almost independent of temperature, in sharp contrast with the dc Hall constant and theoretical predictions. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.033105
DOI:
10.1103/PhysRevB.76.033105
PACS:
71.20.−b, 71.30.+h, 78.20.−e
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.