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首页> 外文期刊>Physica, C. Superconductivity and its applications >The normal state Hall effect in Nd1-2xCaxMxBa2Cu3O7-delta (M = Pr, Th): Evidence for hole localization by disorder
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The normal state Hall effect in Nd1-2xCaxMxBa2Cu3O7-delta (M = Pr, Th): Evidence for hole localization by disorder

机译：Nd1-2xCaxMxBa2Cu3O7-δ（M = Pr，Th）中的正常状态霍尔效应：无序孔定位的证据

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摘要

The transport properties of sintered samples of Nd1-2xCaxMxBa2Cu3O7-delta (M = Pr, Th) with 0 <= x <= 0.10 have been studied in the normal state by Hall effect measurements. The Hall coefficient at high temperature was almost constant for Ca-Pr while it increased with increasing Ca-Th doping concentration. The results for the Hall coefficient as a function of temperature and doping concentration were analyzed within two different models. A good agreement between models and data was obtained. On the basis of these models, it was inferred that Ca-Pr and Ca-Th doping introduce electronic disorder in the CUO2 planes. The localization tendency is driven by electronic disorder. This is the main reason for strong depression of the superconducting critical temperature in both alloys. It was found that the Hall angle is proportional to T-2 in the whole measured temperature range in Ca-Pr doped samples while there are deviations at high temperature in the Ca-Th doped series. In a phenomenological narrow band model, the conduction band was asymmetric for the pure sample and this asymmetry decreased with increasing Ca-Th doping while it was almost constant for Ca-Pr doped samples. (c) 2005 Elsevier B.V. All rights reserved.
机译：在正常状态下，通过霍尔效应测量研究了Nd1-2xCaxMxBa2Cu3O7-δ（M = Pr，Th）的烧结样品在正常状态下的传输性能。 Ca-Pr在高温下的霍尔系数几乎恒定，而随着Ca-Th掺杂浓度的增加而增加。在两个不同的模型中分析了霍尔系数随温度和掺杂浓度变化的结果。模型与数据之间取得了良好的一致性。根据这些模型，可以推断出Ca-Pr和Ca-Th掺杂会在CUO2平面中引入电子失调。定位趋势是由电子混乱驱动的。这是两种合金中超导临界温度强烈下降的主要原因。发现在掺杂Ca-Pr的样品中，霍尔角在整个测量温度范围内与T-2成正比，而在掺杂Ca-Th的系列中，高温下存在偏差。在现象学窄带模型中，纯样品的导带不对称，并且随着Ca-Th掺杂的增加，这种不对称性降低，而Ca-Pr掺杂的样品则几乎不变。 （c）2005 Elsevier B.V.保留所有权利。

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