Publication: Factors limiting ferroelectric field-effect doping in complex oxide heterostructures
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2018-08-14
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Amer Physical Soc
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Abstract
Ferroelectric field-effect doping has emerged as a powerful approach to manipulate the ground state of correlated oxides, opening the door to a different class of field-effect devices. However, this potential is not fully exploited so far, since the size of the field-effect doping is generally much smaller than expected. Here we study the limiting factors through magnetotransport and scanning transmission electron and piezoresponse force microscopy in ferroelectric/superconductor (YBa₂Cu₃O_(7-δ)/BiFeO₃) heterostructures, a model system showing very strong field effects. Still, we find that they are limited in the first place by an incomplete ferroelectric switching. This can be explained by the existence of a preferential polarization direction set by the atomic terminations at the interface. More importantly, we also find that the field-effect carrier doping is accompanied by a strong modulation of the carrier mobility. Besides making quantification of field effects via Hall measurements not straightforward, this finding suggests that ferroelectric poling produces structural changes (e.g., charged defects or structural distortions) in the correlated oxide channel. Those findings have important consequences for the understanding of ferroelectric field effects and for the strategies to further enhance them.
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©2018 American Physical Society.
Work was supported by ERC Grant No. 64710 “SUSPINTRONICS”, French ANR Grant No. ANR- 15-CE24- 0008-01, and European COST action 16218 “Nanocohybri”. Work at UCM was supported by Spanish MINECO-FEDER MAT2015-66888-C3-3-R and ERC PoC2016 POLAR-EM. Electron microscopy observations at ORNL were supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division. J.S. thanks INP-CNRS and “Scholarship program Alembert” funded by the IDEX Paris-Saclay ANR-11-IDEX-0003-02 for support during his stay at the Unité Mixte de Physique CNRS/Thales. J.E.V. thanks S. Fusil and V. Garcia for discussions and suggestions.
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