Charge transport of Bi_{2-x}Pb_xSr_2ErCu_2O_8 single crystals near the insulator-superconductor transition

Details Charge transport of Bi_{2-x}Pb_xSr_2ErCu_2O_8 single crystals near the insulator-superconductor transition Charge transport of Bi_{2-x}Pb_xSr_2ErCu_2O_8 single crystals near the insulator-superconductor transition

2002-04-25

arxiv.org/abs/cond-mat/0204537v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages 4 figures, Proc. of ISS 2001, Physica C (in press)

Scientific paper

10.1016/S0921-4534(02)01414-4

We prepared a set of Pb-substituted Bi_{2-x}Pb_xSr_2ErCu_2O_8 single crystals. The resistivity and the in-plane thermopower decrease with increasing x from 0 to 0.8, which indicates that the Pb substitution supplies holes in the CuO_2 plane. For x=0.8, a tiny resistivity drop (a trace of superconductivity) is seen near 70 K, suggesting that the doping level is close to the critical concentration. The c-axis dielectric constant also systematically changes with x, and suggests that the charge inhomogeneity is suppressed by the Pb substitution.

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