Inter-chain interaction of metallic 1D-chain in PrBa{sub}2Cu{sub}4O{sub}8

摘要

The a- and b-axis resistivities and the a-axis magnetoresistivities applying magnetic field (B) along all three crystallographic axes in non-superconductive PrBa{sub}2Cu{sub}4O{sub}8 single crystals have been measured using four-probe method. Resistivity along the b-axis (parallel to double-chains) showed a highly conductive behavior, of which the origin is attributed to the double-chains because of a large anisotropic conduction between a- and b-axis directions. However, a metallic behavior along the a-axis was also observed in temperature region below 130 K, which could be understood in terms of presence of finite and coherent inter-chain interaction along the a-axis direction. This conclusion is derived from good agreement with values of mean-free path length in the double chain, l{sub}(chain) estimated from both the ρ{sub}b-T curve and the a-axis MR applying B//c using quasi-one-dimensional (quasi-1D) band model.