Anisotropic ab-plane optical response of the charge-density-wave superconductor P4W14O50

Z. T. Zhu, J. L. Musfeldt, Z. S. Teweldemedhin, M. Greenblatt

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13 Scopus citations


We report the polarized optical reflectance of P4W14O50, the only charge-density-wave (CDW) superconductor in the monophosphate tungsten bronze family, over a wide frequency range. The 300-K infrared spectra are dominated by two-dimensional behavior: high reflectance with weak phonons in the conducting ab plane and low reflectance with strong vibrational modes along the interlayer direction anisotropic intra-t2g d→d excitation (∼ 10000 cm-1) reveals the "hidden" one-dimensional band structures in P4W14O50. The variable temperature ab-plane spectra clearly show a suppression of the optical conductivity along the b axis below 140 K, giving rise to charge localization and anisotropic CDW gap formation at ∼1400 cm-1. Although the oscillator strength is redistributed among the free-carrier response, the CDW gap absorption, and the d→d transition in the density wave states, the spectral weight is largely conserved below the plasma frequency. The ab-plane phonons become well resolved in the CDW states due to reduced screening. Based upon these observations, P4W14O50 is another example of a superconductor with an unusual normal state.

Original languageEnglish (US)
Article number214519
Pages (from-to)2145191-2145198
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number21
StatePublished - Jun 1 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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