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arXiv 1608.03006cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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$_{1.83}$-$_{0.17}$ CuO $_{4\pmδ}$薄膜的无序灵敏泵浦探测研究

Disorder-sensitive pump-probe measurements on Nd$_{1.83}$Ce$_{0.17}$CuO$_{4\pmδ}$ films

Adolfo Avella, Carmela Buonavolontà, Anita Guarino, Massimo Valentino, Antonio Leo, Gaia Grimaldi, Corrado de Lisio, Angela Nigro, Giampiero Pepe

摘要:

我们发现一个明确的无序驱动的电阻和行为的温度依赖性的功能之间的关系,作为温度的函数,描述的光致差分时间分辨反射率的三个样品的Nd $_{1.83}$ Ce $_{0.17}$ CuO $_{4\pmδ}$的一些弛豫过程所需的参数。后者,共享相同的Ce含量,已被制造和退火的特设,以不同的程度的混乱,主要是有关的氧含量和位置,因此,对于温度依赖性的电阻:其中两个呈现出最小的电阻和表现为超导体和金属,分别作为第三行为作为绝缘体。所有三个样品的电阻和弛豫参数在温度下的行为之间的系统一致性是绝对显著的,并且表明泵浦-探测测量可以对无序非常敏感,因为它驱动新的激发和相关弛豫通道的出现,如在这种典型情况下。

英文摘要:

We find an unambiguous relationship between disorder-driven features in the temperature dependence of the resistance and the behavior, as functions of the temperature, of the parameters necessary to describe some of the relaxation processes in the photoinduced differential time-resolved reflectivity of three samples of Nd$_{1.83}$Ce$_{0.17}$CuO$_{4\pmδ}$. The latter, sharing the same Ce content, have been fabricated and annealed ad-hoc in order to differ only for the degree of disorder, mainly related to oxygen content and location, and, consequently, for the temperature dependence of the resistance: two of them present a minimum in the resistance and behave as a superconductor and as a metal, respectively, the third behaves as an insulator. The systematic coherence between the resistance and the relaxation parameters behaviors in temperature for all three samples is absolutely remarkable and shows that pump-probe measurements can be extremely sensitive to disorder as it drives the emergence of new excitations and of the related relaxation channels as in this paradigmatic case.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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