Nernst effect in single crystals of the pnictide superconductorCaFe1.92Co0.08As2and parent compoundCaFe2As2

2009/11/30 by Marcin Matusiak, M. Matusiak, Z. Bukowski +2 · 55 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Iron-based superconductors research #Nernst effect #Nernst equation #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Pnictogen #Quantum mechanics #Quasiparticle #Seebeck coefficient #Superconductivity #Superconductivity in MgB2 and Alloys #Thermodynamics #Thermoelectric effect #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.81.020510

published in Physical Review B 81(2) (American Physical Society) · 6 pages, 3 figures; (v2) slight changes and clarifications; to appear in Phys. Rev. B

arxiv created 2010/01/08 · openalex publication_date 2010/01/27 · arxiv updated 2015/05/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report a combined study of the Nernst coefficient (\ensuremathν), Hall effect, and thermoelectric power of CaFe₂As₂ and CaFe_1.92Co_0.08As₂ single crystals. The absolute value of \ensuremathν 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 CaFe_1.92Co_0.08As₂ crystal we do not see any feature of \ensuremathν(T), which could be clearly associated with SDW fluctuations. In this Co-doped sample there is also no noticeable increase in of \ensuremathν in the vicinity of superconducting transition despite the expectation of such due to vortex movement.

Citations

• Measurement and analysis of the Hall effect of A-Fe₂As₂ single crystals with A = Ba, Ca or Sr
• Small anisotropy, weak thermal fluctuations, and high field superconductivity in Co-doped iron pnictide Ba(Fe1−xCox)2As2
• Onset of the vortexlike Nernst signal aboveTcinLa2−xSrxCuO4andBi2Sr2−yLayCuO6
• The theory of the galvanomagnetic and thermomagnetic effects in metals
• A key role for unusual spin dynamics in ferropnictides
• Different resistivity response to spin-density wave and superconductivity at 20 K in Ca1−xNaxFe2As2
• Nernst effect, quasiparticles, andd-density waves in cuprates

Cited by

• Doping dependence of the Nernst effect in Eu(Fe1−xCox)2As2: Departure from Dirac-fermion physics
• Both Electron and Hole Dirac Cone States inBa(FeAs)2Confirmed by Magnetoresistance
• Thermoelectric properties of iron-based superconductors and parent compounds
• The Order-Parameter Symmetry and Fermi Surface Topology of 122 Fe-Based Superconductors: A Point-Contact Andreev-Reflection Study

Related

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• Charge order-driven nematicity in the nickel-pnictide superconductor Ba_1-xSr_xNi₂As₂
• Different resistivity response to spin-density wave and superconductivity at 20 K in Ca1−xNaxFe2As2