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首页> 外文期刊>Physical review >Nernst effect in NdBa_2{Cu_(1-y)Ni_y}_3O_(7-δ) (y =0-0.12)
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Nernst effect in NdBa_2{Cu_(1-y)Ni_y}_3O_(7-δ) (y =0-0.12)

机译:NdBa_2 {Cu_(1-y)Ni_y} _3O_(7-δ)(y = 0-0.12)中的能斯特效应

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摘要

In NdBa_2{Cu_(1-y)Ni_y}_3O_(7-δ), magnetic Ni-impurities suppress T_c but at the same time the pseudogap is strongly enhanced. This unique feature makes it an ideal system to study possible relations between the anomalous Nernst effect, superconductivity, and the pseudogap. We present Nernst effect measurements on a series of optimally doped (O_7) and underdoped (O_(6.8)) samples with Ni contents ranging from y=0 to 0.12. In all samples an onset of the Nernst signal is found at T~v > T_c. For the optimally doped samples T~v and T_c decrease simultaneously with increasing Ni content. The underdoped samples show a different behavior, i.e., the onset of the Nernst signal is hardly affected by increasing the Ni content from y=0 to 0.03. Irrespective of the oxygen content, T~v clearly does not track the enhanced pseudogap temperature T~*.
机译:在NdBa_2 {Cu_(1-y)Ni_y} _3O_(7-δ)中,磁性Ni杂质会抑制T_c,但同时伪间隙会大大增强。这个独特的功能使其成为研究异常能斯特效应,超导性和拟间隙之间可能关系的理想系统。我们对Ni含量在y = 0至0.12之间的一系列最佳掺杂(O_7)和欠掺杂(O_(6.8))样品进行能斯特效应测量。在所有样本中,能斯特信号的始发点在Tv> T_c。对于最佳掺杂的样品,T_v和T_c随着Ni含量的增加而同时降低。掺杂不足的样品表现出不同的行为,即,将Ni含量从y = 0增加到0.03几乎不会影响能斯特信号的发生。不管氧含量如何,T_v显然都不能追踪到提高的伪能隙温度T〜*。

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