標題: Tunable disorder and localization in the rare-earth nickelates
作者: Wang, Changan
Chang, Ching-Hao
Huang, Angus
Wang, Pei-Chun
Wu, Ping-Chun
Yang, Lin
Xu, Chi
Pandey, Parul
Zeng, Min
Boettger, Roman
Jeng, Horng-Tay
Zeng, Yu-Jia
Helm, Manfred
Chu, Ying-Hao
Ganesh, R.
Zhou, Shengqiang
交大名義發表
材料科學與工程學系
National Chiao Tung University
Department of Materials Science and Engineering
公開日期: 2-五月-2019
摘要: We demonstrate that transport in metallic rare-earth nickelates can be engineered by directly tuning the electronic mean free path. Using irradiation as a tool to induce disorder, we drive this system from a metallic phase into an Anderson insulator. This proceeds via an intermediate regime which shows a thermal crossover from insulating to metallic behavior. We argue that this phase falls within the paradigm of weak localization in three dimensions. We develop a theoretical model for the temperature dependence of resistivity which shows good agreement with our data. The three-dimensional weak localization picture is supported by magnetoconductivity, which scales as similar to B-2 up to several tesla. Interestingly, our data indicate that this phase lies in the Mott-Ioffe-Regel regime with the mean free path approaching the lattice constant. Upon further increasing disorder, the charge carriers are localized, leading to insulating behavior at all temperatures. Our results show that irradiation provides a "clean" tuning knob for the mean free path, without altering other system parameters. This suggests promising directions for studies of Anderson localization.
URI: http://dx.doi.org/10.1103/PhysRevMaterials.3.053801
http://hdl.handle.net/11536/151941
ISSN: 2475-9953
DOI: 10.1103/PhysRevMaterials.3.053801
期刊: PHYSICAL REVIEW MATERIALS
Volume: 3
Issue: 5
起始頁: 0
結束頁: 0
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