Electric and magnetic characterization of NbSe2 single crystals: anisotropic superconducting fluctuations above Tc

TL;DR

This study provides a detailed electric and magnetic characterization of NbSe2 single crystals, investigates superconducting fluctuations above Tc, and demonstrates the applicability of Ginzburg-Landau theory to analyze fluctuation-diamagnetism in this anisotropic superconductor.

Contribution

First detailed characterization of NbSe2 crystals combined with analysis of superconducting fluctuations above Tc using Ginzburg-Landau theory.

Findings

Observation of fluctuation effects for magnetic fields in two crystallographic orientations

Superconducting parameters support reliable Ginzburg-Landau analysis

Demonstration of anisotropic superconducting fluctuations above Tc

Abstract

Electric and magnetic characterization of NbSe2 single crystals is first presented in detail. Then, some preliminary measurements of the fluctuation-diamagnetism (FD) above the transition temperature Tc are presented. The moderate uniaxial anisotropy of this compound allowed us to observe the fluctuation effects for magnetic fields H applied in the two main crystallographic orientations. The superconducting parameters resulting from the characterization suggest that it is possible to do a reliable analysis of the FD in terms of the Ginzburg-Landau (GL) theory.