Anomalous Electronic Raman Scattering in NaxCoO2·yH2O

P. Lemmens, K. Y. Choi, V. Gnezdilov, E. Ya. Sherman, D. P. Chen, C. T. Lin, F. C. Chou, and B. Keimer
Phys. Rev. Lett. 96, 167204 – Published 26 April 2006

Abstract

Raman scattering experiments on NaxCoO2·yH2O single crystals show a broad electronic continuum with a pronounced peak around 100cm1 and a cutoff at approximately 560cm1 over a wide range of doping levels. The electronic Raman spectra in superconducting and nonsuperconducting samples are similar at room temperature, but evolve in markedly different ways with decreasing temperature. For superconducting samples, the low-energy spectral weight is depleted upon cooling below T*150K, indicating the opening of a pseudogap that is not present in nonsuperconducting materials. Weak additional phonon modes observed below T* suggest that the pseudogap is associated with charge ordering.

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  • Received 27 October 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.167204

©2006 American Physical Society

Authors & Affiliations

P. Lemmens1,2, K. Y. Choi3,4, V. Gnezdilov5, E. Ya. Sherman6, D. P. Chen1, C. T. Lin1, F. C. Chou7, and B. Keimer1

  • 1Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany
  • 2Institute for Condensed Matter Physics, TU Braunschweig, D-38106 Braunschweig, Germany
  • 32. Physikalisches Institute, RWTH Aachen, D-52056 Aachen, Germany
  • 4Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 5B. I. Verkin Institute for Low Temperature Physics, NASU, 61164 Kharkov, Ukraine
  • 6Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
  • 7Center for Materials Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA

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Issue

Vol. 96, Iss. 16 — 28 April 2006

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