Researchers at Tokyo Tech identify the quantum critical point in superconductors, solving a three-decade-old mystery and enhancing the understanding of superconductivity fluctuations. Credit: SciTechDaily.com, have been successfully detected by a research group at Tokyo Institute of Technology .
However, it has been known since the 1990s that for samples with relatively weak localization effects, an anomalous metallic state appears in the intermediate magnetic field region where the electrical resistance is several orders of magnitude lower than the normal state. The origin of this anomalous metallic state is thought to be a liquid-like state in which magnetic flux lines that penetrate into the superconductor move around due to quantum fluctuations.
However, to further clarify the origin of the anomalous metallic state, it is necessary to elucidate the mechanism by which the superconducting state is destroyed by quantum fluctuation and transitions to the normal state. In this study, they performed measurements aimed at detecting the superconducting fluctuation state , which is a precursor state of superconductivity and is thought to exist in the normal state.
When a temperature difference is applied in the longitudinal direction of the sample,the superconducting fluctuations and the motion of the magnetic flux lines generate a voltage in the transverse direction. In contrast, normal electron motion generates voltage primarily in the longitudinal direction.
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