Journal of Superconductivity

, Volume 10, Issue 4, pp 319–321

Evidence for onset of charge density wave in the La-based Perovskite superconductors

  • A. Lanzara
  • N. L. Saini
  • M. Brunelli
  • A. Valletta
  • A. Bianconi
Article
  • 72 Downloads

Abstract

Recent studies have shown that structural instabilities play a vital role in high-Tc superconductivity. We have used a local structural probe, extended X-ray absorption fine structure (EXAFS), to investigate the instability of the CuO2 plane in La-based high-Tc perovskite systems. Temperature-dependent CuK-edge EXAFS spectra measured on single crystals of La1.85Sr0.15CuO4 (LSCO) and La2CuO4.1 (LCO) show a characteristic temperature (Tls) where the local structure of the system diverges from the average one. This temperature coincides with a crossover temperature where the system shows anomalous metal-insulator transition in transport measurements. We have discussed the EXAFS results as an evidence for a particular phase transition of the system with segregation of localized and itinerant charge carriers in a short coherence charge density wave (CDW). A phase diagram for this CDW has been proposed.

Key Words

Lanthanum copper oxide charge density wave EXAFS 

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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • A. Lanzara
    • 1
  • N. L. Saini
    • 1
  • M. Brunelli
    • 1
  • A. Valletta
    • 1
  • A. Bianconi
    • 1
  1. 1.Dipartimento di Fisica Università di Roma “La Sapienza”RomaItaly

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