Nodeless multigap superconductivity in organic ion intercalated (tetrabutyl ammonium)0.3FeSe
Jinyu Wu, Mengzhu Shi, Jianwei Shu, Zhaoyang Shan, Toni Shiroka, Devashibhai Adroja, Xianhui Chen, Michael Smidman
DOI 10.1103/PhysRevB.110.134504 · Physical Review B
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Abstract
We probe the superconducting order parameter of the organic-ion-intercalated FeSe-based superconductor (tetrabutyl ammonium)0.3FeSe [(TBA)0.3FeSe] using muon-spin relaxation/rotation (μSR). Zero-field μSR measurements show only a weak temperature dependence with no evidence for magnetic ordering or broken time-reversal symmetry in the superconducting state. The temperature dependence of the superfluid density is deduced from transverse-field μSR measurements with fields applied both parallel and perpendicular to the c axis, and can be well described by a nodeless two-gap s+s model. These properties are reminiscent of those of (Li1−xFex)OHFe1−ySe, which also has a comparably enhanced Tc, suggesting that such a gap structure is a common feature of quasi-two-dimensional intercalated FeSe-based superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (TBA)0.3FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48 | Pressure not reported | onset |
| (CTA)0.3FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 45 | Pressure not reported | onset |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
| Li0.56(NH2)0.53(NH3)1.19Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| Li0.6(NH2)0.2(NH3)0.8Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | unknown |
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