Europhys. Lett.
Volume 72, Number 5, December 2005
Page(s) 795 - 801
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 03 November 2005
Europhys. Lett., 72 (5), pp. 795-801 (2005)
DOI: 10.1209/epl/i2005-10315-8

Study on the normal-state transport properties of $\chem{La_{1.6-{\it x}}Nd_{0.4}Sr_{\it x}CuO_{4}}$ films

Y. Liu, J. F. Qu, Y. Q. Zhang and X. G. Li

Hefei National Laboratory for Physical Sciences at Microscale Department of Materials Science and Engineering University of Science and Technology of China, Hefei 230026, PRC

received 11 March 2005; accepted in final form 7 October 2005
published online 3 November 2005

The normal-state transport properties of $\chem{La_{1.6-{\it x}}Nd_{0.4}Sr_{\it x}CuO_{4}}$ films (x = 0.08, 0.1, 0.12, 0.14, 0.16) have been discussed with a one-dimensional transport model proposed by Moshchalkov et al.  The linear-T dependent resistivity $\rho _{ab} $ in the high-temperature regime is dominated by the charge diffusion in two dimensions, while the superlinear behavior of $\rho _{ab} $ upon cooling results from one-dimensional charge transport. With further decreasing temperature, a low-temperature logarithmic behavior is observed from underdoped to optimally doped samples. The mechanism of the localization is ascribed to the freezing of charges into the stripes. We emphasize that the pseudogap can be well understood within the charge stripe scenario.

74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).
74.72.Dn - La-based cuprates.

© EDP Sciences 2005