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Abstract
In-plane electrical impedance has been examined in as-grown single crystals of BaFe2As2, one of the parent compounds of iron-based superconductors. From the results, it is found that the real part of the impeditivity, namely the AC resistivity, reveals the in-plane anisotropy of the material without any applied uniaxial strain. The imaginary part, i.e., the reactivity, also indicates strong in-plane anisotropy and is linearly dependent on the electrical frequency. Our study demonstrates that electrical impedance is a new and effective method of probing the electron nematicity of iron-based superconductors.
Highlights
Among various experimental probes for examining high-Tc superconductivity in iron pnictides, the transport probe has hitherto been a key component in elucidating the role of magnetism,7 the nature of chemical and structural tuning,8 and the pairing symmetry
The transport probe, as a bulk measurement tool unlike scanning tunneling microscopy and other microscopic methods,11,12 provides limited details of the interactions involved in the pairing, such as Coulomb repulsion, spin fluctuation, and electron– phonon coupling
Regarding the temperature-dependent AC resistivity of the asgrown single crystals, the in-plane AC resistivity anisotropy without applied strain can be observed in Fig. 1(a), and the in-plane DC resistivity anisotropy is observed under uniaxial strain.20–23 ρx is determined as the resistivity of the crystalline a-axis, i.e., ρx(a), and ρy is the resistivity of the crystalline b-axis, i.e., ρy(b); here, a and b are defined by the orthorhombic lattice unit cell for easy comparison with results in detwinned samples (a ≈ b ≈ 5.6 Å, c = 12.8 Å)
Summary
Superconductivity is observed in LaFeAsO1-xFx at Tc=26 K,1 and occurs above 40 K in related compounds or under an external pressure. iron-based superconductors are classified as a new high-Tc superconducting family, breaking the McMillan limitation based on the strong coupling theory of Bardeen, Cooper, and Schrieffer (commonly known as BCS theory). Among various experimental probes for examining high-Tc superconductivity in iron pnictides, the transport probe has hitherto been a key component in elucidating the role of magnetism, the nature of chemical and structural tuning, and the pairing symmetry. there are many possibilities for the further development of these probes. Among various experimental probes for examining high-Tc superconductivity in iron pnictides, the transport probe has hitherto been a key component in elucidating the role of magnetism, the nature of chemical and structural tuning, and the pairing symmetry.. The transport probe, as a bulk measurement tool unlike scanning tunneling microscopy and other microscopic methods, provides limited details of the interactions involved in the pairing, such as Coulomb repulsion, spin fluctuation, and electron– phonon coupling.. It is widely believed that high-Tc superconductivity in pnictides emerges by tuning the interactions that are already present in the parent compounds. The DC electric transport probe cannot measure the nematic correlations or fluctuations unless a uniaxial pressure is applied to detwin the sample.
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