Anisotropy of the In-Plane and Out-of-Plane Resistivity and the Hall Effect in the Normal State of Vicinal-Grown YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ Thin Films

TL;DR

This study investigates the anisotropic electrical transport properties of YBa₂Cu₃O₇−δ thin films, revealing distinct in-plane and out-of-plane resistivity and Hall effect behaviors in the normal state.

Contribution

It demonstrates the use of vicinal-grown thin films to explore anisotropic transport properties, confirming previous findings with a novel measurement approach.

Findings

In-plane Hall voltage is positive and temperature-dependent.

Out-of-plane Hall voltage is negative and nearly temperature-independent.

Vicinal thin films are effective for layered nanomaterial studies.

Abstract

The resistivity and the Hall effect in the copper-oxide high-temperature superconductor YBa$_{2}$Cu$_{3}$O$_{7-\delta}$ (YBCO) are remarkably anisotropic. Using a thin film of YBCO grown on an off-axis cut SrTiO$_3$ substrate allows one to investigate these anisotropic transport properties in a planar and well-defined sample geometry employing a homogeneous current density. In the normal state, the Hall voltage probed parallel to the copper-oxide layers is positive and strongly temperature dependent, whereas the out-of-plane Hall voltage is negative and almost temperature independent. The results confirm previous measurements on single crystals by an entirely different measurement method and demonstrate that vicinal thin films might be also useful for investigations of other layered nanomaterials.