Anisotropy of the Seebeck and Nernst coefficients in parent compounds of the iron-based superconductors

Abstract

In-plane longitudinal and transverse thermoelectric phenomena in two parent compounds of iron-based superconductors are studied. Namely, the Seebeck (S) and Nernst (n) coefficients were measured in the temperature range 10 - 300 K for BaFe2As2 and CaFe2As2 single crystals that were detwinned in-situ. The thermoelectric response shows sizeable anisotropy in the spin density wave state (SDW) for both compounds, while some dissimilarities in the vicinity of the SDW transition can be attributed to the different nature of the phase change in BaFe2As2 and CaFe2As2. Temperature dependences of S and n can be described within a two-band model that contains a contribution from highly mobile, probably Dirac, electrons. The Dirac band seems to be rather isotropic, whereas most of the anisotropy in the transport phenomena could be attributed to "regular" hole-like charge carriers. We also observe that the off-diagonal element of the Peltier tensor axy is not the same for the a and b orthorhombic axes, which indicates that the widely used Mott formula is not applicable to the SDW state of iron-based superconductors.

arXiv comment17 pages, 7 figures

References in corpus (33)

• Electronic Liquid Crystal Phases of a Doped Mott Insulator
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
• Intra-unit-cell electronic nematicity of the high-Tc copper-oxide pseudogap states
• Divergent nematic susceptibility in an iron arsenide superconductor
• Broken rotational symmetry in the pseudogap phase of a high-Tc superconductor
• Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
• Stripe phases in high-temperature superconductors
• Enhancement of superconductivity near a nematic quantum critical point
• Uniaxial strain detwinning of CaFe2As2 and BaFe2As2: optical and transport study
• Nodal Spin Density Wave and band topology of the FeAs based materials
• Anisotropy in the electrical resistivity and susceptibility of superconducting BaFe${}_2$As${}_2$ single crystals
• Observation of Dirac Cone Electronic Dispersion in BaFe2As2
• Hall effect and resistivity study of the magnetic transition, carrier content and Fermi liquid behavior in Ba(Fe(1-x) Cox)2As2
• The Nernst effect and the boundaries of the Fermi liquid picture
• Enhanced Thermoelectric Power in Graphene: Violation of the Mott Relation By Inelastic Scattering
• Theory of thermopower in 2D graphene
• Manifestations of nematic degrees of freedom in the magnetic, elastic, and superconducting properties of the iron pnictides
• Topological and Transport Properties of Dirac Fermions in Antiferromagnetic Metallic Phase of Iron-Based Superconductors
• Superconductivity from orbital nematic fluctuations
• Three-dimensional electronic structure of superconducting iron pnictides observed by angle-resolved photoemission spectroscopy
• Nernst effect, quasiparticles, and d-density waves in cuprates
• Thermopower as sensitive probe of electronic nematicity in iron pnictides
• Nernst effect in single crystals of the pnictide superconductor CaFe1.92Co0.08As2 and parent compound CaFe2As2
• Dirac nodal pockets in the antiferromagnetic parent phase of FeAs superconductors
• Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2-xNixAs2
• Doping dependence of the Nernst effect in Eu(Fe1-xCox)2As2 - departure from Dirac fermions physics
• Two-dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A = Ba, Sr)
• Evidence of spin-density-wave order in RFeAsO from measurements of thermoelectric power
• Pressure effects on the transport coefficients of Ba(Fe1-xCox)2As2
• Violation of the Wiedemann-Franz law as an evidence of the pseudogap in the iron-based superconductor Ba(Fe1-xCox)2As2
• Multiband thermal transport in the iron-based superconductor Ba1 xKxFe2As2
• Measurement and analysis of the Hall effect of A-Fe${}_2$As${}_2$ single crystals with A = Ba, Ca or Sr

Cited by in corpus (7)

• Thermoelectric properties of (an-)isotropic QGP in magnetic fields
• Thermoelectric anisotropy in Ba(Fe1-xCox)2As2 iron-based superconductor
• Crossover from itinerant to localized states in the thermoelectric oxide [Ca${}_2$CoO${}_3$]${}_{0.62}$[CoO${}_2$]
• Strain-derivative of thermoelectric properties: a sensitive probe for nematicity
• Multi-band effects in in-plane resistivity anisotropy of strain-detwinned disordered Ba(Fe${}_{1-x}$Ru${}_x$)${}_2$As${}_2$
• Thermoelectric signature of the nematic phase in iron-based superconductor
• Apparatus Design for Measuring of the Strain Dependence of the Seebeck Coefficient of Single Crystals