Doping dependence of the specific heat of single crystal BaFe2(As1-xPx)2

TL;DR

This study investigates how the specific heat and superconducting properties of BaFe2(As1-xPx)2 single crystals change with phosphorous doping, revealing a unique scaling law and doping-dependent parameters.

Contribution

It provides new experimental data on doping dependence of specific heat and superconducting parameters in BaFe2(As1-xPx)2, constraining theoretical models.

Findings

Specific heat follows Delta_C/Tc ~ Tc^2 scaling.

Ginzburg-Landau parameter decreases with doping.

Superconducting anisotropy remains constant at ~2.6.

Abstract

We present specific heat measurements on a series of BaFe2(As1-xPx)2 single crystals with phosphorous doping ranging from x = 0.3 to 0.55. Our results reveal that BaFe2(As1-xPx)2 follows the scaling Delta_C/Tc ~ Tc^2 remarkably well. The clean-limit nature of this material imposes new restraints on theories aimed at explaining the scaling. Furthermore, we find that the Ginzburg-Landau parameter decreases significantly with doping whereas the superconducting anisotropy is gamma~2.6, independent of doping.