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Prof. Beatriz Noheda received her PhD in Experimental Physics from the Department of Physics, Universidad Autonoma de Madrid (UAM), Spain. After several post-doctoral positions as Lecturer, Assistant Physicist, Research Fellow and Assistant/Associate Professor in Madrid, Brookhaven, Amsterdam, and Groningen, she was promoted in 2014 to become Full Professor at the Zernike Institute for Advanced Materials, Groningen, as well as leading the Groningen Cognitive Systems and Materials Center “CogniGron” as its director. Her research focuses on ferroic materials and nanostructures thereof, with special emphasis on the bottom-up assembly of tailor-made materials with distinct functionalities (conductivity, polarity, magnetism) and applications (neuromorphic computing, etc.).
Prof. Dr. Lukas M. Eng
Überblick
Rare earth nickelates (ReNiO3) undergo a metal-insulator transition (MIT) that can be tuned both chemically (choice of Re) and physically (strain or electric field). Nickelates hold great promise for resistive switching applications, such as for memories or adaptable electronics. The interest on these materials has recently increased even further due to the finding of superconductivity on the related family of infinite-layer nickelates[1]. However, a complete understanding of the metallic phase in these strongly correlated electron systems is still one of the central open problems in condensed matter physics. For instance, nickelates have been proposed to behave both as bad metals[2] and as normal metals[3] by different researchers. Moreover, the behavior of the nickelates as Fermi-liquid or non-Fermi liquid systems is also highly debated, as various scaling exponents of the resistivity as a function of temperature have been reported in the same materials [3,4].
In this talk, I will show that the resistivity-temperature exponent in epitaxially-grown NdNiO3 films can be continuously tuned by the combined effect of epitaxial strain and disorder[5], validating previous theoretical results by Patel et al [6]. Therefore, the assignment of Fermi liquid/non-Fermi liquid behavior from the resistivity-temperature exponents is not always justified and a detail micro-structural characterization is needed. In addition, I will describe our latest experiments that aim to establish the nature of the metallic behavior in the NdNiO3.
[1] D. Li, et al., Nature 572, 624 (2019). [2] R. Jaramillo, et al., NPhysics 10, 304 (2014). [3] E. Mikheev, et al., Sci, Adv. 1, e1500797 (2015). [4] J. Liu, et al., NComms. 4, 2714 (2013). [5] Q. Guo, B. Noheda, et al., https://arxiv.org/abs/1909.06256. [6] N.D. Patel, et al., Phys. Rev. Lett. 119, 086601 (2017).
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