Carrier concentrations in Bi2Sr2-zLazCuO6+delta single crystals and their relation to the Hall coefficient and thermopower

Article

关键词: T-C;    TRANSPORT;    PHASE;    YBA2CU3O7-DELTA;    SUPERCONDUCTOR;    SCATTERING;    TRANSITION;    OXIDES;    POWER;   

DOI  :  10.1103/PhysRevB.61.R14956

来源: SCIE

【 摘 要 】

We measured the thermopower S and the Hall coefficients R-H of Bi2Sr2-zLazCuO6+delta (BSLCO) single crystals in a wide doping range, in an effort to identify the actual hole concentrations per Cu, p, in this system. It is found that the universal relation between the room-temperature thermopower and T-c does not hold in the BSLCO system. Instead, comparison of the temperature-dependent R-H data with other cuprate systems is used as a tool to identify the actual p value. To justify this approach, we compare normalized R-H(T) data of BSLCO, La2-xSrxCuO4 (LSCO), YBa2Cu3Oy, and Tl2Ba2CuO6+delta, and demonstrate that the R-H(T) data of the LSCO system can be used as a template for the estimation of p. The resulting phase diagram of p vs T-c suggests that T-c is anomalously suppressed in the underdoped samples, becoming zero at around p similar or equal to 0.10, while the optimum T-c is achieved at p similar or equal to 0.16 as expected.

【 授权许可】

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