Scaling of the physical properties in Ba(Fe,Ni)2As2 single crystals: Evidence for quantum fluctuations

TL;DR

This study investigates the scaling behavior of physical properties in Ba(Fe,Ni)2As2 single crystals, revealing evidence for quantum fluctuations affecting superconductivity and related phenomena.

Contribution

It provides experimental evidence linking quantum fluctuations to the scaling of magnetic and thermodynamic properties in iron-based superconductors.

Findings

London penetration depth scales with Tc as λ(0) ∝ Tc^{-0.85}

Temperature-dependent change in penetration depth scales as Δλ(T) ∝ T^{2.3}

Results suggest quantum fluctuations influence the physical properties near the superconducting transition.

Abstract

We report on local magnetization, tunnel diode oscillators, and specific-heat measurements in a series of Ba(NixFe1-x)2As2 single crystals (0.26\leqx\leq0.74). We show that the London penetration depth \lambda(T)=\lambda(0)+\Delta\lambda(T) scales as \lambda(0)\propto1/Tc0.85$\pm$0.2, \Delta\lambda(T)\proptoT2.3$\pm$0.3 (for T