Disentangling transport mechanisms in a correlated oxide by photoinduced charge injection
Disentangling transport mechanisms in a correlated oxide by photoinduced charge injection
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DOI：
10.1103/physrevmaterials.7.l123201
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发表时间：
2023-11
影响因子：
3.4
通讯作者：
Henry Navarro;Sarmistha Das;Felipe Torres;Rourav Basak;Erbin Qiu;Nicolas M. Vargas;Pavel Lapa;Ivan K. Schuller;A. Frano
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文献类型：
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作者：
Henry Navarro;Sarmistha Das;Felipe Torres;Rourav Basak;Erbin Qiu;Nicolas M. Vargas;Pavel Lapa;Ivan K. Schuller;A. Frano
我们提出了一种新颖的异质结构方法，通过将镍酸盐放置在光电导体 CdS 下方，来解开强相关 PrNiO3 的电传输机制。这使得载流子以受控方式注入 PrNiO3 中，可用于询问其固有的传输机制。我们发现，当在低于 PrNiO3 金属-绝缘体转变的温度下照射系统时，非易失性电阻会降低。随着温度升高，光致变化变得更加不稳定。这些数据有助于了解镍酸盐-CdS 双层的固有传输特性。结合裸 PrNiO3 薄膜的数据，我们发现传输机制包括热激活和可变范围跳跃等机制的组合。在没有光生载流子的低温下，传输由跳跃控制，而在较高温度和强光照下，激活机制变得相关。这项工作展示了一种光学控制 PrNiO3 耐低温性能的新方法。
We present a novel heterostructured approach to disentangle the mechanism of electrical transport of the strongly correlated PrNiO3, by placing the nickelate under the photoconductor CdS. This enables the injection of carriers into PrNiO3 in a controlled way, which can be used to interrogate its intrinsic transport mechanism. We find a non-volatile resistance decrease when illuminating the system at temperatures below the PrNiO3 metal-insulator transition. The photoinduced change becomes more volatile as the temperature increases. These data help understand the intrinsic transport properties of the nickelate-CdS bilayer. Together with data from a bare PrNiO3 film, we find that the transport mechanism includes a combination of mechanisms including both thermal activation and variable range hopping. At low temperatures without photoinduced carriers the transport is governed by hopping, while at higher temperatures and intense illumination the activation mechanism becomes relevant. This work shows a new way to optically control the low-temperature resistance of PrNiO3.