Abstract
The study of transverse resistance of superconductors is essential to understand the transition to superconductivity. Here, we investigated the in-plane transverse resistance of Ba0.5K0.5Fe2As2 superconductors, based on ultra-thin micro-bridges fabricated from optimally doped single crystals. An anomalous transverse resistance was found at temperatures around the superconducting transition, although magnetic order or structure distortion are absent in the optimal doping case. With the substitution of magnetic and nonmagnetic impurities into the superconducting layer, the anomalous transverse resistance phenomenon is dramatically enhanced. We find that anisotropic scattering or the superconducting electronic nematic state related with the superconducting transition may contribute to this phenomenon.
Highlights
For a low-dimensional superconductor, like an ultra-thin film, an anomalous transverse resistance (ATR) can often be observed as the temperature is lowered towards Tc, the investigation of ATR will provide insight into the dynamics of the condensation of Cooper pairs
Since antiferromagnetic order occurs in the under-doped state of these materials[9,10], an anomalous Hall effect may contribute to the ATR in the absence of external magnetic fields
It is greatly important to explore the dynamics of electron pairing and transport, which yields to the origin of magnetic order and electronic nematicity
Summary
For a low-dimensional superconductor, like an ultra-thin film, an anomalous transverse resistance (ATR) can often be observed as the temperature is lowered towards Tc, the investigation of ATR will provide insight into the dynamics of the condensation of Cooper pairs. An anomalous transverse voltage is reported on the under-doped La2-xSrxCuO4 single-crystalline thin films[8], and the in-plane angular-dependent ATR exhibits a sin(2φ) oscillation breaking the four-fold rotational symmetry of the lattice. The origin of this two-fold ATR was attributed to the anisotropic electronic state, namely, the electronic nematicity, which provides a promising path to understand the ATR in this case. The anomalous Hall effect, vortex motion, or electronic nematic state can hardly be regarded as the origin of the observed ATR, and a possible origin will be discussed
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