Angular dependence of the fluctuation magnetization vector above the superconducting transition of a highly anisotropic high-Tc cuprate

TL;DR

This study investigates how the magnetization vector's orientation in highly anisotropic cuprate superconductors varies with magnetic field direction above the critical temperature, revealing deviations from expected behavior.

Contribution

It extends previous measurements of magnetization orientation to the fluctuation region above Tc, showing deviations in highly anisotropic cuprates.

Findings

Magnetization vector deviates from perpendicular orientation above Tc

Orientation dependence persists in the fluctuation region

Results suggest complex anisotropic magnetic behavior

Abstract

In highly anisotropic cuprate superconductors it is generally accepted that the reversible magnetization vector, M, is essentially perpendicular to the superconducting CuO2 layers in a wide range of crystal orientations with respect to the applied magnetic field, H. In a recent work [J. Mosqueira et al., Phys. Rev. B 84, 134504 (2011)] it is shown, however, that the dependence of M on the H orientation in the reversible mixed state of a high-quality Tl-based cuprate presents a notable deviation from this behavior. Here we extend these measurements to the fluctuation region above Tc, in order to check whether the above mentioned effect is also present.