Doping dependence of the Nernst effect in Eu(Fe1-xCox)2As2 - departure from Dirac fermions physics

Abstract

We report a systematic study of the transport properties in the series of Eu(Fe1-xCox)2As2 single crystals with x = 0, 0.15, 0.20 and 0.30. Spin-density-wave order is observed in the undoped and the least doped samples (x = 0, 0.15), while for x = 0.15 and 0.20 Eu(Fe1-xCox)2As2 becomes a superconductor. We found the properties of the parent EuFe2As2 compound well described by the Dirac fermions model, whereas cobalt doping caused an evolution of the system toward a regular metallic state. The antiferromagnetic ordering of the Eu2+ ions at T_N ~ 20 K has only minor influence on the measured quantities.

5 pages, 5 figures; ver.3: the sign convention for the Nernst coefficient is changed

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• Interplay between magnetism and superconductivity in EuFe(2-x)Co(x)As2 studied by 57Fe and 151Eu Mössbauer spectroscopy
• BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe
• Thermoelectric properties of iron-based superconductors and parent compounds
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• Two-dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A = Ba, Sr)
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• Coexistence of Dirac-Cone States and Superconductivity in Iron Pnictide Ba(Fe${}_{1-x}$Ru${}_x$As)${}_2$
• Pressure effects on the transport coefficients of Ba(Fe1-xCox)2As2
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• Magneto Seebeck effect in REFeAsO (RE=rare earth) compounds: probing the magnon drag scenario
• Anisotropy of the Seebeck and Nernst coefficients in parent compounds of the iron-based superconductors
• Magnetothermoelectric effects in Fe{1+d}Te{1-x}Se{x}
• Anisotropic magnetic excitations and incipient Néel order in Ba(Fe${}_{1-x}$Mn${}_x$)${}_2$As${}_2$
• Electronic Phase Diagram of SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Effect of Structural Dimensionality
• Violation of the Wiedemann-Franz law as an evidence of the pseudogap in the iron-based superconductor Ba(Fe1-xCox)2As2
• Strain-derivative of thermoelectric properties: a sensitive probe for nematicity
• Physical Properties of $B{a}_{2}M{n}_{2}S{b}_{2}O$ Single Crystals
• Re-entrance of resistivity due to the interplay of superconductivity and magnetism in $\ce{Eu_{0.73}Ca_{0.27}(Fe_{0.87}Co_{0.13})2As2}$
• Lack of superconductivity in the phase diagram of single-crystalline Eu(Fe1-xCox)2As2 grown by transition metal arsenide flux
• Linear scaling relation between two-dimensional massless Dirac fermion Fermi velocity and Fe-As bond length in iron arsenide superconductor systems
• Tuning superconductivity by magnetic fields in Eu(Fe0.81Co0.19)2As2
• Nernst effect of iron pnictide and cuprate superconductors: signatures of spin density wave and stripe order