Discovery of abnormal electrical resistance related to superconductivity
Under the leadership of TATEIWA Naoyuki , Vice Senior Research Manager, MATSUDA Tatsuma , Vice Senior Research Manager, HAGA Yoshinori , Sub Leader, and Zachary Fisk , Group Leader of the Advanced Science Research Center, Japan Atomic Energy Agency, and ONUKI Yoshichika , Professor, Visiting Researcher, Osaka University, a group of researchers has successfully discovered that in URu 2 Si 2 , a uranium-based compound with superconductive properties, electrical resistance closely related to superconductivity occurs.
Superconductivity occurs when electrons are attracted to each other by gravity. In superconducting solids such as lead, vibrations of the crystal lattice plays the role of gravity. Strongly correlated electron systems need stronger gravity, so the mechanism of superconductivity in the system is different from that of usual superconductivity.
This group looked for the mechanism of superconductivity of URu 2 Si 2 with a strong correlation between electrons in terms of electric resistance at high pressure.
Electrons in a solid material are scattered by impurities and other electrons, causing electrical resistance. Therefore, if one studies changes in electrical resistance, one can get information about the electron scattering intensity in the solid material. In order to remove the effect of impurities, in experiments, they created very pure single crystal and measured electrical resistance at high pressure up to 15000 bar. As a result, abnormal electrical resistance was observed in URu 2 Si 2 superconductivity phase, showing abnormal electron scattering.
This group also has demonstrated superconducting transition temperature had a proportional relation with the observed intensity of abnormal electron scattering.
To learn more about this research, please read the full research report entitled " Strong correlation between anomalous quasiparticle scattering and unconventional superconductivity in the hidden-order phase of URu2Si2° " on this page at the American Physical Society website.
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