Variable-range hopping conductivity in the copper-oxygen chains of La_3Sr_3Ca_8Cu_24O_41
Superconductivity
2010-10-05 v2 Strongly Correlated Electrons
Abstract
We show that the spin chain/ladder compound La_3Sr_3Ca_8Cu_24O_41 is an insulator with hopping transport along the chains. In the temperature range 35 - 280 K, DC conductivity sigma_{DC}(T) follows Mott's law of variable-range hopping conduction; the frequency dependence has the form sigma(\nu, T) = \sigma_{DC}(T) + A(T)\nu^{s}, where s \approx 1. The conduction mechanism changes from variable-range hopping to nearest-neighbor hopping around T_{c} =300 K. The chain array thus behaves like a one-dimensional disordered system. Disorder is due to random structural distortions of chains induced by irregular coordination of the La/Sr/Ca ions.
Keywords
Cite
@article{arxiv.cond-mat/0212439,
title = {Variable-range hopping conductivity in the copper-oxygen chains of La_3Sr_3Ca_8Cu_24O_41},
author = {T. Vuletic and B. Korin-Hamzic and S. Tomic and B. Gorshunov and P. Haas and M. Dressel and J. Akimitsu and T. Sasaki and T. Nagata},
journal= {arXiv preprint arXiv:cond-mat/0212439},
year = {2010}
}
Comments
4 pages, 3 figures, accepted for publication in PRB