An inter comparison of the upper critical fields (Hc2) of different superconductors - YBa2Cu3O7, MgB2, NdFeAsO0.8F0.2, FeSe0.5Te0.5 and Nb2PdS5

TL;DR

This paper compares the upper critical fields of various superconductors using two theoretical models, providing insights into their properties through experimental synthesis and high-field measurements.

Contribution

It offers a systematic comparison of Hc2 in different superconductors using WHH and Ginzburg-Landau theories, based on synthesized samples and high-field data.

Findings

Hc2 values vary across superconductor types

Both models provide consistent Hc2 estimates

Data enhances understanding of superconductor limits

Abstract

Here we report the comparison of the upper critical fields of different superconductors being calculated by two different theories i.e., Werthamer Helfand Hohenburg (WHH) and Ginzberg Landau (GL). All the samples are synthesized through previously known solid state reaction route. Phase purity is determined from the Rietveld refinement of powder X-Ray diffraction (XRD) data. High field (up to 14Tesla) magneto transport \r{ho}(T)H of different superconductors is studied to estimate their upper critical field (Hc2). The present inter comparison covers from Cuprates (YBa2Cu3O7) - Borides (MgB2) - Fe pnictides (NdFeAsO0.8F0.2) and chalcogenides (FeSe0.5Te0.5) to robust Nb2PdS5. The upper critical fields [Hc2(T)] at zero temperature are calculated by extrapolating the data using GL and WHH equations.