Anisotropic magnetotransport of superconducting and normal state in an electron-doped Nd_{1.85}Ce_{0.15}CuO_{4-\delta} single crystal

TL;DR

This study investigates the anisotropic magnetotransport properties of an electron-doped Nd_{1.85}Ce_{0.15}CuO_{4- extdelta} single crystal, revealing the upper critical field, anisotropy factor, and magnetoresistance behavior in both superconducting and normal states.

Contribution

The paper provides the first detailed analysis of the anisotropic magnetotransport in electron-doped Nd_{1.85}Ce_{0.15}CuO_{4- extdelta} single crystals, including measurements of H_{c2}(T) and magnetoresistance.

Findings

Anisotropy factor  estimated to be about 8.

Magnetoresistance follows an H^2 dependence, with H||c being nearly 10 times larger than H||ab.

The superconductor exhibits moderate anisotropy compared to hole-doped cuprates.

Abstract

The anisotropic properties of an optimally doped Nd_{1.85}Ce_{0.15}CuO_{4-\delta} single crystal have been studied both below and above the critical temperature Tc via the resistivity measurement in magnetic field H up to 12 T. By scaling the conductivity fluctuation around the superconducting transition, the upper critical field H_{c2}(T) has been determined for field parallel to the c-axis or to the basal ab-plane. The anisotropy factor \gamma={H_c2||ab}/{H_c2||c} is estimated to be about 8. In the normal state (50=<T=<180 K), the magnetoresistance (MR) basically follows an H^2 dependence and for H||c it is almost 10 times larger than that for H||ab. Comparing with hole-doped cuprates it suggests that the optimally doped Nd_{1.85}Ce_{0.15}CuO_{4-\delta} cuprate superconductor has a moderate anisotropy.