Search for Superconducting Energy Gap in UPt3 by Point-Contact Spectroscopy

International Conference on Strongly Correlated Electron Systems 2014

Gouchi, Jun^1 ; Sumiyama, Akihiko^1 ; A., Yamaguchi ; G., Motoyama ; N., Kimura ; E., Yamamoto ; Y., Haga ; Y., O'Nuki

Graduate School of Material Science, University of Hyogo, Hyogo

678-1297, Japan^1

Department of Material Science, Shimane University, Matsue

690-8504, Japan^2

Center for Low Temperature Science, Tohoku University, Sendai

980-8578, Japan^3

Advanced Science Research Center, Japan Atomic Energy Agency, Tokai

319-1195, Japan^4

Department of Physics and Earth Sciences, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^5

关键词: Differential resistances;    Minimum structures;    Normal metals;    Point contact spectroscopy;    Superconducting energy gap;    Superconducting state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012066/pdf
DOI  :  10.1088/1742-6596/592/1/012066

来源: IOP

【 摘 要 】

We have investigated the differential resistance of the point contacts between heavy-fermion superconductor UPt3and a normal metal Pt, which were fabricated using a commercial piezo-electric actuator, and retried the observation of the energy gap of UPt3. A V-shaped dip is observed in both normal and superconducting states and disappeared around TK∼ 20 K, suggesting that it is related to the Kondo effect. Below the superconducting transition temperature, a shallow double-minimum structure, which indicates the energy gap, has been observed for the contacts on the faces perpendicular to the a-, b- and c-axes of UPt3.