Out-of-plane conductivity in Bi2Sr2CuOy crystals

Wang, N. L.; Geibel, C.; Steglich, F.

doi:10.1016/0921-4534(96)00139-6

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Out-of-plane conductivity in Bi₂Sr₂CuO_y crystals

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Wang, N. L., Geibel, C., & Steglich, F. (1996). Out-of-plane conductivity in Bi₂Sr₂CuO_y crystals. Physica C, 260(3-4), 305-312. doi:10.1016/0921-4534(96)00139-6.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-E79F-C

Abstract

We present extensive measurements of anisotropic resistivity on Bi2Sr2CuOy crystals grown from melts with different Bi/Sr ratios and doped with Pb. We find that the temperature variation of the c-axis resistivity rho(c)(T) is correlated with the in-plane resistivity rho(ab). Depending on the starting compositions, the normal-state in-plane resistivity rho(ab) can either show localized conduction at low temperature or be metallic (d rho(ab)/dT > 0) in the whole temperature range. Correspondingly, a change of the T dependence of rho(c) from nonmetallic (d rho(c)/dT < 0) in the whole measured temperature range (4.2-300 K) to a mixed (d rho(c)/dT < 0 at low T but d rho(c)/dT > 0 at high T) conduction is observed. In accompany, the magnitude of rho(c) at low T decreases by about two orders. We have quantified the trend of the rho(c)(T) and examined some current proposals concerning the out-of-plane transport.