Thermoelectric signature of the nematic phase in iron-based superconductor

Abstract

Studies of the copper-based superconductors demonstrate how their phase diagram becomes more complex as experimental probes improve, able to distinguish among subtly different electronic phases. One of those phases, nematicity, has become the matter of great interest also in the iron-based superconductors, where it is detected deep in the tetragonal state. Here we present the evolution of the in-plane Nernst effect anisotropy in the strain detwinned Ca(Fe1-xCox)2As2 single crystals, whose behaviour can be explained within the approach developed to describe the nematic order parameter in liquid crystals [1,2]. Furthermore, the employed method turns out to be universally applicable to data from other superconductors: Ba(Fe1-xCox)2As2 [3] as well as YBa2Cu3Oy [4]. We conclude the observed broken rotational symmetry of the electronic system is a consequence of the emerging thermodynamic electronic nematic order at a temperature much higher than onset of the magnetic and structural transitions.

arXiv comment17 pages, 4 figures

References in corpus (28)

• Nematic order in iron superconductors - who is in the driver's seat?
• Magnetic-field-induced charge-stripe order in the high temperature superconductor YBa2Cu3Oy
• Nematic Fermi Fluids in Condensed Matter Physics
• Broken rotational symmetry in the pseudogap phase of a high-Tc superconductor
• Determination of the phase diagram of the electron doped superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Nematic and meta-nematic transitions in the iron pnictides
• Formation of a Nematic Fluid at High Fields in Sr3Ru2O7
• The remarkable underlying ground states of cuprate superconductors
• Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
• Enhancement of superconductivity near a nematic quantum critical point
• Competition and coexistence of antiferromagnetism and superconductivity in underdoped Ba(Fe0.953Co0.047)2As2
• Uniaxial strain detwinning of CaFe2As2 and BaFe2As2: optical and transport study
• Electrical and Thermal Transport at the Planckian Bound of Dissipation in the Hydrodynamic Electron Fluid of WP2
• Nernst effect in metals and superconductors: a review of concepts and experiments
• Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor
• Neutron scattering study of the magnetic phase diagram of underdoped YBa(2)Cu(3)O(6+x)
• Sign-reversal of the in-plane resistivity anisotropy in hole-doped iron pnictides
• Sign-reversal of the in-plane resistivity anisotropy in iron pnictides
• Two types of nematicity in the phase diagram of the cuprate superconductor YBa${}_2$Cu${}_3$O${}_y$
• Topological and Transport Properties of Dirac Fermions in Antiferromagnetic Metallic Phase of Iron-Based Superconductors
• Phase diagram of iron-arsenide superconductors Ca(Fe1-xCox)2As2 (0 <= x <= 0.2)
• Two-dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A = Ba, Sr)
• Imaging anomalous nematic order and strain in optimally doped BaFe${}_2$(As,P)${}_2$
• Thermoelectric anisotropy in Ba(Fe1-xCox)2As2 iron-based superconductor
• Thermal expansion of CaFe2As2: effect of cobalt doping and post-growth thermal treatment
• Direct visualization of phase separation between superconducting and nematic domains in Co-doped CaFe2As2 close to a first order phase transition
• Anisotropy of the Seebeck and Nernst coefficients in parent compounds of the iron-based superconductors
• Gap-like feature in the normal state of $\mathbf{X}(\mathbf{F}{\mathbf{e}}_{1-\mathbf{x}}\mathbf{C}{\mathbf{o}}_{\mathbf{x}}{)}_2\mathbf{A}{\mathbf{s}}_2$, $\mathbf{X}=\mathbf{Ba},\mathbf{Sr}$ and $\mathbf{F}{\mathbf{e}}_{1+\mathbf{y}}\mathbf{Te}$ revealed by Point Contact Spectroscopy