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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Tailoring Materials for Mottronics: Excess Oxygen Doping of a Prototypical Mott Insulator Philipp Scheiderer , Matthias Schmitt , Judith Gabel , Michael Zapf , Martin Stuebinger , Philipp Schütz , Lenart Dudy , Christoph Schlueter , Tien-lin Lee , Michael Sing , Ralph Claessen Advanced Materials 327 DOI: 10.1002/adma.201706708 Diamond Proposal Number(s): [14106, 15200, 15856, 18372] Show Abstract ▼ Abstract: The Mott transistor is a paradigm for a new class of electronic devices—often referred to by the term Mottronics—which are based on charge correlations between the electrons. Since correlation‐induced insulating phases of most oxide compounds are usually very robust, new methods have to be developed to push such materials right to the boundary to the metallic phase in order to enable the metal–insulator transition to be switched by electric gating. Here, it is demonstrated that thin films of the prototypical Mott insulator LaTiO3 grown by pulsed laser deposition under oxygen atmosphere are readily tuned by excess oxygen doping across the line of the band‐filling controlled Mott transition in the electronic phase diagram. The detected insulator to metal transition is characterized by a strong change in resistivity of several orders of magnitude. The use of suitable substrates and capping layers to inhibit oxygen diffusion facilitates full control of the oxygen content and renders the films stable against exposure to ambient conditions. These achievements represent a significant advancement in control and tuning of the electronic properties of LaTiO3+x thin films making it a promising channel material in future Mottronic devices.	May 2018
	In Situ Control of Separate Electronic Phases on SrTiO 3 Surfaces by Oxygen Dosing Lenart Dudy , Michael Sing , Philipp Scheiderer , Jonathan D. Denlinger , Philipp Schütz , Judith Gabel , Mathias Buchwald , Christoph Schlueter , Tien-lin Lee , Ralph Claessen Advanced Materials 28, 7443 - 7449 DOI: 10.1002/adma.201600046 Show Abstract ▼ Abstract: Insulating SrTiO3 (STO) can host 2D electron systems (2DESs) on its surfaces, caused by oxygen defects. This study shows that the STO surface exhibits phase separation once the 2DES is formed and relates this inhomogeneity to recently reported magnetic order at STO surfaces and interfaces. The results open pathways to exploit oxygen defects for engineering the electronic and magnetic properties of oxides.	Sep 2016

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I09-Surface and Interface Structural Analysis

Tailoring Materials for Mottronics: Excess Oxygen Doping of a Prototypical Mott Insulator