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Raman scattering versus infrared conductivity:  Evidence for one-dimensional conduction in La2xSrxCuO4

F. Venturini, Q.-M. Zhang, R. Hackl, A. Lucarelli, S. Lupi, M. Ortolani, P. Calvani, N. Kikugawa, and T. Fujita
Phys. Rev. B 66, 060502(R) – Published 6 August 2002
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Raman and infrared (IR) spectra of an underdoped La1.90Sr0.10CuO4 single crystal have been measured as a function of temperature. Both techniques provide unconventional low-energy spectra. The IR conductivity exhibits features peaked at finite frequencies which do not have a counterpart in the Raman response. Below approximately 100 K a transfer of both Raman and IR spectral weight towards lower energies is found and a new component in the Raman response builds up being characterized by a very long lifetime of electrons propagating along the Cu-O bonds.

  • Received 8 March 2002


©2002 American Physical Society

Authors & Affiliations

F. Venturini1, Q.-M. Zhang1,*, R. Hackl1, A. Lucarelli2, S. Lupi2, M. Ortolani2, P. Calvani2, N. Kikugawa3, and T. Fujita3

  • 1Walther Meissner Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
  • 2INFM and Dipartimento di Fisica, Università di Roma “La Sapienza,” Piazzale Aldo Moro 2, 00185 Roma, Italy
  • 3ADSM, Hiroshima University, Higashi-Hiroshima 739-8526, Japan

  • *Permanent address: National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, P. R. China.

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Vol. 66, Iss. 6 — 1 August 2002

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