Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: Transport and theory of electronic structure

HL 8.7: Vortrag

Montag, 1. April 2019, 16:30–16:45, H33

Tunable disorder and localization in the rare-earth nickelates — •Changan Wang1, Ching-Hao Chang2, Angus Huang3, Lin Yang5, Roman Böttger1, Manfred Helm1, Ying-Hao Chu4, Ramachandran Ganesh6, and Shengqiang Zhou11Helmholtz-Zentrum-Dresden-Rossendorf, Dresden, Germany — 2Leibniz-Institute for Solid State and Materials Research, Dresden, Germany — 3National Tsing Hua University, Taiwan — 4National Chiao Tung University, Taiwan — 5South China Normal University, Guangzhou, China — 6The Institute of Mathematical Sciences, Chennai, India

The rare-earth nickelates are a rich playground for transport properties, known to host non-Fermi liquid character, resistance saturation and metal-insulator transitions. We report a disorder engineering in LaNiO3 by ion-irradiation generated scattering centres in a tunable fashion to induce localization. While pristine LaNiO3 samples are metallic, highly irradiated samples show insulating behaviour at all temperatures. Using irradiation fluence as a tuning handle, we uncover an intermediate region hosting a metal-insulator transition. In the high temperature metallic regime, we find a transition from non-Fermi liquid to a Fermi-liquid-like character. On the insulating side of the metal-insulator transition, we find behaviour that is consistent with weak localization. In the highly irradiated insulating samples, we find good agreement with variable range hopping, consistent with Anderson localization. Our results demonstrate that ion irradiation can be used to tailor transport and study the physics of localization.

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