Search for superconducting energy gap in UPt3 by point-contact spectroscopy

Jun Gouchi; Akihiko Sumiyama; Akira Yamaguchi; Gaku Motoyama; Noriaki Kimura; Etsuji Yamamoto; Yoshinori Haga; Yoshichika O'Nuki

doi:10.1088/1742-6596/592/1/012066

Search for superconducting energy gap in UPt₃ by point-contact spectroscopy

Jun Gouchi, Akihiko Sumiyama, Akira Yamaguchi, Gaku Motoyama, Noriaki Kimura, Etsuji Yamamoto, Yoshinori Haga, Yoshichika O'Nuki

SCI - Physics

Research output: Contribution to journal › Conference article › peer-review

2 Citations (Scopus)

Abstract

We have investigated the differential resistance of the point contacts between heavy-fermion superconductor UPt₃ and 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 T_K ∼ 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.

Original language	English
Article number	012066
Journal	Journal of Physics: Conference Series
Volume	592
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/592/1/012066
Publication status	Published - 2014
Event	2014 International Conference on Strongly Correlated Electron Systems, SCES 2014 - Grenoble, France Duration: 2014 Jul 7 → 2014 Jul 14

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Search for superconducting energy gap in UPt3 by point-contact spectroscopy",

abstract = "We have investigated the differential resistance of the point contacts between heavy-fermion superconductor UPt3 and 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.",

author = "Jun Gouchi and Akihiko Sumiyama and Akira Yamaguchi and Gaku Motoyama and Noriaki Kimura and Etsuji Yamamoto and Yoshinori Haga and Yoshichika O'Nuki",

note = "Copyright: Copyright 2018 Elsevier B.V., All rights reserved.; 2014 International Conference on Strongly Correlated Electron Systems, SCES 2014 ; Conference date: 07-07-2014 Through 14-07-2014",

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AU - Gouchi, Jun

AU - Sumiyama, Akihiko

AU - Yamaguchi, Akira

AU - Motoyama, Gaku

AU - Kimura, Noriaki

AU - Yamamoto, Etsuji

AU - Haga, Yoshinori

AU - O'Nuki, Yoshichika

PY - 2014

Y1 - 2014

N2 - We have investigated the differential resistance of the point contacts between heavy-fermion superconductor UPt3 and 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.

AB - We have investigated the differential resistance of the point contacts between heavy-fermion superconductor UPt3 and 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.

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