Sign-reversal of the in-plane resistivity anisotropy in iron pnictides

Abstract

The concept of an electronically-driven breaking of the rotational symmetry of a crystal, without involving magnetic order, has found experimental support in several systems, from semiconductor heterostructures and ruthenates, to cuprate and iron-pnictide superconductors. In the pnictide BaFe${}_2$As${}_2$, such an "electronic nematic state" appears above the magnetic transition dome, over a temperature range that can be controlled by external strain. Here, by measuring the in-plane resistivity anisotropy, we probe the electronic anisotropy of this material over the entire nematic/magnetic dome, whose end points coincide with the optimal superconducting transition temperatures. Counter-intuitively, we find that, unlike other materials, the resistivity anisotropy in BaFe${}_2$As${}_2$ changes sign across the doping phase diagram, even though the signs of the magnetic, nematic, and orthorhombic order parameters are kept fixed. This behavior is explained by the Fermi surface reconstruction in the magnetic phase and spin-fluctuation scattering in the nematic phase. The unique behavior of the transport anisotropy unveils that the primary role is played by magnetic scattering in the normal state transport properties of the iron pnictides, suggesting a close connection between magnetism, nematicity, and unconventional superconductivity.

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• Electronic nematic susceptibility of iron-based superconductors
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• Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained $BaF{e}_{2}A{s}_2$
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• Resistive anisotropy due to spin-fluctuation scattering in the nematic phase of iron pnictides
• Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
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• Interplane resistivity of underdoped single crystals (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$, $0\le x<0.34$
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• Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba${}_{0.67}$K${}_{0.33}$Fe${}_2$As${}_2$
• Antiferromagnetic spin correlations and pseudogap-like behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity
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• In-plane electronic anisotropy in the antiferromagnetic-orthorhombic phase of isovalent-substituted Ba(Fe${}_{1-x}$Ru${}_x$)${}_2$As${}_2$
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• Memory function approach to in-plane anisotropic resistivity in the antiferromagnetic phase of iron arsenide superconductors
• Infrared probe of the gap evolution across the phase diagram of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Highly anisotropic quasiparticle interference patterns in the spin-density wave state of the iron pnictides
• Multi-band effects in in-plane resistivity anisotropy of strain-detwinned disordered Ba(Fe${}_{1-x}$Ru${}_x$)${}_2$As${}_2$
• Potential Lifshitz transition at optimal substitution in nematic pnictide Ba${}_{1-x}$Sr${}_x$Ni${}_2$As${}_2$
• Quasi-one Dimensional Nanostructures as Sign of Nematicity in Iron Pnictides and Chalcogenides
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• Disorder-Induced Electronic Nematicity
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• Nematic properties of FeSe${}_{1-x}$Te${}_x$ crystals with a low Te content
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