Variable-range hopping conductivity in the copper-oxygen chains of La3Sr3Ca8Cu24O41

T. Vuletić, B. Korin-Hamzić, S. Tomić, B. Gorshunov, P. Haas, M. Dressel, J. Akimitsu, T. Sasaki, and T. Nagata
Phys. Rev. B 67, 184521 – Published 29 May 2003
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Abstract

We show that the spin chain/ladder compound La3Sr3Ca8Cu24O41 is an insulator with hopping transport along the chains. In the temperature range 35–280 K, dc conductivity σdc(T) follows Mott’s law of variable-range hopping conduction; the frequency dependence has the form σ(ν,T)=σdc(T)+A(T)νs, where s1. The conduction mechanism changes from variable-range hopping to nearest-neighbor hopping around Tc=300K. The chain array thus behaves as a one-dimensional disordered system. Disorder is due to random structural distortions of chains induced by irregular coordination of the La/Sr/Ca ions.

  • Received 13 December 2002

DOI:https://doi.org/10.1103/PhysRevB.67.184521

©2003 American Physical Society

Authors & Affiliations

T. Vuletić*, B. Korin-Hamzić, and S. Tomić

  • Institut za fiziku, P.O. Box 304, HR-10001 Zagreb, Croatia

B. Gorshunov, P. Haas, and M. Dressel

  • 1. Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany

J. Akimitsu and T. Sasaki

  • Department of Physics, Aoyama-Gakuin University, Setagaya-ku, Tokyo 157-8572, Japan

T. Nagata

  • Department of Physics, Ochanomizu University, Bunkyo-ku, Tokyo 112-8610, Japan

  • *Electronic address: tvuletic@ifs.hr
  • URL:http://www.ifs.hr/real_science
  • Permanent address: General Physics Institute, Russian Academy of Sciences, Moscow, Russia.

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Vol. 67, Iss. 18 — 1 May 2003

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