Transport Properties of Bi$_2$Sr$_{2-x}$La$_x$CaCu$_2$O$_{8+δ}$ Single Crystals Grown by a Floating-Zone Method

Details Transport Properties of Bi$_2$Sr$_{2-x}$La$_x$CaCu$_2$O$_{8+δ}$ Single Crystals Grown by a Floating-Zone Method Transport Properties of Bi$_2$Sr$_{2-x}$La$_x$CaCu$_2$O$_{8+δ}$ Single Crystals Grown by a Floating-Zone Method

2003-01-21

arxiv.org/abs/cond-mat/0301404v2

Physics

Condensed Matter

Strongly Correlated Electrons

4pages, 4 figures, proceedings of International Symposium on Superconductivity 2002, Physica C

Scientific paper

10.1016/S0921-4534(03)00836-0

A parent insulator of the Bi-based high-$T_c$ superconductor Bi$_2$Sr$_{2-x}$La$_x$CaCu$_2$O$_{8+\delta}$ was successfully grown by a traveling solvent floating zone method. The in-plane resistivity $\rho_{ab}$ shows metallic behavior ($d\rho_{ab}/dT >$ 0) near room temperature, although the magnitude of the resistivity is far above the Mott limit for metallic conduction. The Hall mobility of the parent insulator does not so much differ from that of an optimally doped sample. These results suggest that the system is not a simple insulator with a well-defined gap, and the hole in the parent insulator is essentially itinerant, as soon as it is doped.

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