Nodal superconducting gap in tetragonal FeS
Jie Xing, Hai Lin, Yufeng Li, Sheng Li, Xiyu Zhu, Huan Yang, Hai-Hu Wen
DOI 10.1103/PhysRevB.93.104520 · Physical Review B
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Abstract
Low-temperature specific heat has been measured in FeS superconductor with the transition temperature of 4.55 K. It is found that the low-temperature electronic specific heat Ce/T can be fitted to a linear relation in the low-temperature region, but fails to be described by an exponential relation as expected by an s-wave gap. We try fittings to the data with different gap structures and find that a model with one or two nodal gaps can fit the data. Under a magnetic field, the field induced specific heat coefficient Δγe=[Ce(H)−Ce(0)]/T shows the Volovik relation Δγe(H)∝H, suggesting the presence of nodal gap(s) in this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.55 | Pressure not reported | onset |
| FeS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.15 | Pressure not reported | zero_resistance |
| FeS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| FeS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | midpoint |
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