Observation of non-Fermi liquid behaviors on high-mobility LaNiO<sub>3</sub>
ORAL
Abstract
LaNiO3 (LNO) is a special member of the rare-earth perovskite nickelate family, as it does not show metal-insulator or magnetic transitions at low temperatures. Whether or not LNO behaves like a Fermi liquid in the low temperature regime with quadratic temperature dependence of resistivity remains an open question. Recent measurements of the electronic structure and theoretical calculations support the presence of structural and magnetic instabilities in LNO. However, the impact of these instabilities has yet to be clarified in transport measurements, partly because preparing high-quality LNO samples had been challenging due to a propensity towards oxygen vacancy formation. Here, we report on the observation of non-Fermi liquid transport behaviors at sub-Kelvin temperatures in high-mobility LNO thin films grown by ozone-assisted molecular beam epitaxy. The resistivity of these samples can be lower than 4 μΩ cm at T = 2 K, with residual resistivity ratios (RRR) [ρ (300 K) / ρ (2 K)] > 24.
*Supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The use of facilities at the Center for Nanoscale Materials was supported by the US Department of Energy, Basic Energy Sciences under Contract No. DE-AC02-06CH11357.
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Presenters
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Changjiang Liu
- Argonne National Laboratory
- Materials Science Division, Argonne National Laboratory