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Updated: Dec 31, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Electrical conduction mechanisms of metal / high-T c superconductor (YBCO) interfaces
L F Lanosa1, H Huhtinen2, P Paturi2
1Laboratorio de Bajas Temperaturas, Departamento de Física, FCEyN, Universidad de Buenos Aires and IFIBA, UBA-CONICET, Pabellón I, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina.
Abstract:
Current-voltage characteristics of Au/YBa2Cu3O[Formula: see text] interfaces (Au/YBCO), built on optimally-doped YBCO thin films, grown by pulsed laser deposition, were measured as a function of temperature in the 50 K to 270 K range, for two different resistance states. A non-trivial equivalent circuit model is proposed, which reveals the existence of a highly inhomogeneous scenario composed by two complex layers: one presenting both a non-linear Poole-Frenkel conduction as well as variable range hopping localization effects (probably associated with YBa2Cu3O6) mixed with a minor metallic phase, while the other is also composed by a mixture of YBCO with different oxygen contents, where a metallic ohmic phase still percolates. A microscopic description of the effects produced by the resistance switching is given, showing the evolution of carrier traps, localization effects and dielectric behavior for each state. The dielectric behavior is interpreted in terms of a Maxwell-Wagner scenario.
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