Nernst effect in single crystals of the pnictide superconductor CaFe1.92Co0.08As2 and parent compound CaFe2As2
Marcin Matusiak, Zbigniew Bukowski, Janusz Karpinski
DOI 10.1103/PhysRevB.81.020510 · Physical Review B
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Abstract
We report a combined study of the Nernst coefficient (ν), Hall effect, and thermoelectric power of CaFe2As2 and CaFe1.92Co0.08As2 single crystals. The absolute value of ν in both samples is enhanced, probably due to ambipolar flow of electronlike and holelike quasiparticles. The onset of spin-density-wave (SDW) order in CaFe2As2 causes further rapid rise of the Nernst coefficient. On the contrary, in the CaFe1.92Co0.08As2 crystal we do not see any feature of ν(T), which could be clearly associated with SDW fluctuations. In this Co-doped sample there is also no noticeable increase in of ν in the vicinity of superconducting transition despite the expectation of such due to vortex movement.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe1.92Co0.08As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20.4 | Pressure not reported | midpoint |
| CaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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