Fully-gapped superconductivity in Ba0.55K0.45Fe1.95Co0.05As2: A low-temperature specific heat study
K. Gofryk, J. C. Lashley, F. Ronning, D. J. Safarik, F. Weickert, J. L. Smith, A. Leithe-Jasper, W. Schnelle, M. Nicklas, H. Rosner
DOI 10.1103/PhysRevB.85.224504 · Physical Review B
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Abstract
We have studied the Fe-based superconductor Ba0.55K0.45Fe1.95Co0.05As2 in order to identify the structure of the order parameter in this system by performing extensive low-temperature specific heat measurements in zero and in applied magnetic field. The pronounced superconducting jump at Tc=32.5 K and Δ0/(kBTc)=2.57 indicate strong-coupling superconductivity in this material. Here we provide evidence for fully gapped superconductivity in Ba0.55K0.45Fe1.95Co0.05As2. A linear magnetic field dependence of the low-temperature specific heat points to s-wave symmetry of the order parameter. Below Tc the superconducting electronic part of the specific heat can be described by the BCS α model with Δ0=7.2 meV.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.55K0.45Fe1.95Co0.05As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.5 | Pressure not reported | onset |
| Ba0.55K0.45Fe1.95Co0.05As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.5 | Pressure not reported | zero_resistance |
| BaFe1.84Co0.16As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba0.68K0.32Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.5 | Pressure not reported | unknown |
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