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000861059 1001_ $$0P:(DE-Juel1)168208$$aLeis, Arthur$$b0
000861059 245__ $$aIn-situ four-tip STM investigation of the transition from 2D to 3D charge transport in SrTiO3
000861059 260__ $$a[London]$$bMacmillan Publishers Limited, part of Springer Nature$$c2019
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000861059 520__ $$aThe electrical properties of SrTiO3(100) single crystals were investigated in-situ at different stages of thermal reduction by means of a 4-tip STM. Using the tips of the STM as electrical probes, distance-dependent four-point measurements were performed at the surface of the crystal at room temperature after reduction by thermal treatment. For annealing temperatures T ≤ 700 °C, charge transport is confined to a surface region <3 μm below the surface. For reduction at T ≥ 900 °C a transition from a conducting 2D sheet with insulating bulk to a system with dominant 3D bulk conductivity is found. At an intermediate reduction temperature of T = 800 °C, a regime with mixed 2D/3D contributions is observed in the distance-dependent resistance measurements. Describing the depth-dependent conductivity with an analytical N-layer model, this regime of mixed 2D/3D conductivity is evaluated quantitatively under the assumption of an exponentially decaying conductivity profile, correlated with the previously observed depth-dependent dislocation density in the sample. A non-monotonous temperature dependence of the 3D conductivity in the respective conducting layer is found and possible underlying mechanisms are discussed, particularly with regard to non-intrinsic material properties depending on details of the sample preparation.
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000861059 7001_ $$0P:(DE-Juel1)142194$$aRodenbücher, Christian$$b1
000861059 7001_ $$0P:(DE-HGF)0$$aSzot, Krzysztof$$b2
000861059 7001_ $$0P:(DE-Juel1)128762$$aCherepanov, Vasily$$b3
000861059 7001_ $$0P:(DE-Juel1)128791$$aTautz, F. Stefan$$b4
000861059 7001_ $$0P:(DE-Juel1)128794$$aVoigtländer, Bert$$b5$$eCorresponding author
000861059 773__ $$0PERI:(DE-600)2615211-3$$a10.1038/s41598-019-38888-x$$gVol. 9, no. 1, p. 2476$$n1$$p2476$$tScientific reports$$v9$$x2045-2322$$y2019
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