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R dependence of superconductivity and thermopower in the Bi2Sr2-xRxCuOy (R = La, Sm and Eu) system

机译:Bi2Sr2-xRxCuOy(R = La,Sm和Eu)系统中超导性和热功率的R依赖性

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We have grown single crystals of Bi2Sr2-xRxCuOy with R = La, Sm and Eu for a wide range of R content x and measured resistivity and the thermopower. The relation between the value of thermopower at 290 K, S(290), and the superconducting transition temperature T-c determined simultaneously on the same single crystal clearly shows that T-c at the optimal doping T-c(max) strongly depends on the R element. More importantly, we found that the range of S(290) values of samples with a non-zero T-c is narrower when the R element is changed to one with a smaller ionic radius. The narrowing of the range of S(290) values indicates that the range of carrier density where high-T-c superconductivity occurs in this system depends on the R element. We argue that these behaviors are a consequence of the difference in the transfer integrals in the CUO2 plane accompanied with the structural change caused by replacing the R element to one with a different ionic radius. (c) 2006 Elsevier B.V. All rights reserved.
机译:我们已经生长了具有R = La,Sm和Eu的Bi2Sr2-xRxCuOy单晶,获得了宽范围的R含量x并测量了电阻率和热功率。在同一单晶上同时确定的290 K,S(290)的热功率值与超导转变温度T-c之间的关系清楚地表明,最佳掺杂T-c(max)下的T-c强烈依赖于R元素。更重要的是,我们发现当R元素更改为离子半径较小的一个元素时,具有非零T-c的样品的S(290)值范围会更窄。 S(290)值范围的变窄表明,在该系统中发生高T-c超导的载流子密度范围取决于R元素。我们认为,这些行为是由于CUO2平面中的传递积分不同而导致的,并伴随着结构变化,该变化是通过将R元素替换为具有不同离子半径的元素而引起的。 (c)2006 Elsevier B.V.保留所有权利。

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