Enhanced Nernst effect above Tc in the quasi-two-dimensional iron pnictide superconductor CsCa2Fe4As4F2
Miaocong Li, Zhicheng Wang, Dan Zhao, Yabin Liu, Chenxi Jiang, Tao Wu, Qian Tao, Guang-Han Cao, Zhu-An Xu
DOI 10.1103/PhysRevB.105.104512 · Physical Review B
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Abstract
As a new type of iron pnictide superconductors, CsCa2Fe4As4F2, featured by its unique FeAs bilayer, presents a quasi-two-dimensional characteristic which distinguishes itself from other iron pnictides. Here we systematically investigated its transport properties and thermoelectric effects, including the Seebeck and Nernst effect, and NMR. An unusual hump in the Nernst coefficient is observed as temperature decreases below 90 K, far above its Tc of 28.5 K. Simultaneously there is a suppression in the Hall coefficient as well as the nuclear spin-lattice relaxation rate in the same temperature range. To clarify this phenomenon, we comparatively investigated two other similar iron-based pnictide superconductors, Ba1−xKxFe2As2 and CaKFe4As4. Our work indicates there could exist an incoherence-coherence crossover or a kind of Cooper pairing precursor in CsCa2Fe4As4F2 before achieving its superconductivity, which is different from other iron-based high-Tc superconductors. Such a comparative study may help us to understand the effect of dimensional evolution from three dimensional to two dimensional on high-Tc superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CsCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.5 | Pressure not reported | zero_resistance |
| CaKFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33.9 | Pressure not reported | zero_resistance |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35.6 | Pressure not reported | zero_resistance |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 77 | Pressure not reported | unknown |
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