Anisotropy of the In-Plane and Out-of-Plane Resistivity and the Hall Effect in the Normal State of Vicinal-Grown YBa2Cu3O7−δ Thin Films

Abstract

The resistivity and the Hall effect in the copper-oxide high-temperature superconductor YBa2Cu3O7−δ (YBCO) are remarkably anisotropic. Using a thin film of YBCO grown on an off-axis cut SrTiO3 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.

In-Plane Anisotropy of Electrical Transport in Y0.85Tb0.15Ba2Cu3O7−x Films

“…The YBCO film did not demonstrate in-plane anisotropy due to film twinning. The Hall coefficient of the YBCO film was close to the values reported for optimally doped YBCO single crystals and films [33,34]. In contrast to those of the twinned YBCO film, both the Hall coefficients and the resistivity of the YTBCO films had in-plane anisotropy typical of twin-free YBCO samples [35].…”

Inter- to intra-layer resistivity anisotropy of NdFeAs(O,H) with various hydrogen concentrations

“…Note that for the Hall effect measurements, the bias current was supplied along the longitudinal direction, whereas the Hall voltage was measured along the transverse direction, which is the tilted direction. This may lead to a deviation between the actual carrier density and the measured one [22]. The upper critical field Hc2 was determined by measuring the field dependence of resistivity and using a criterion of 90% of the normal state resistivity.…”