Comment on “Precision global measurements of London penetration depth inFeTe0.58Se0.42”

Comment on ”Precision global measurements of London penetration depth in FeTe0.58Se0.42”

Agreement between local and global measurements of the London penetration depth

Recent measurements of the superconducting penetration depth in Ba(Fe1 xCox)2As2 appeared to disagree on the magnitude and curvature of Dkab(T), even near optimal doping. These measurements were carried out on different samples grown by different groups. To understand the discrepancy, we use scanning SQUID susceptometry and a tunnel diode resonator to measure the penetration depth in a single s...

Magnetic Penetration Depth Measurements in Cuprate Superconductors

We examine recent results on measurements of the magnetic penetration depth in cuprate superconductors, with particular emphasis on our results obtained with the microstrip and parallel-plate resonator techniques. The results show that the magnetic penetration depth temperature dependence in YBa2Cu307-a is not consistent with a simple scaled weak-coupled BCS temperature dependence. We present t...

Global trends in the interplane penetration depth of layered superconductors

We report on generic trends in the behavior of the interlayer penetration depth c of several different classes of quasi-two-dimensional superconductors including high-Tc cuprates, Sr2RuO4, transition-metal dichalcogenides and organic materials of the (BEDT-TTF)2X series. An analysis of these trends reveals two distinct patterns in the scaling between the values of c and the magnitude of the c-a...

Uncertainty in multiple penetration depth fringing electric field sensor measurements

Measurement of multilayer material properties with fringing electric field dielectrometry sensors requires the processing of terminal admittance data from multiple electrode pairs. The choice of the algorithmic approach for data analysis is critical because of a high sensitivity to small measurement uncertainties. While individual channel uncertainties are usually within a reasonable instrument...