Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2

Takuya Yamashita; Takaaki Takenaka; Yoshifumi Tokiwa; Joseph A. Wilcox; Yuta Mizukami; Daiki Terazawa; Yuichi Kasahara; Shunichiro Kittaka; Toshiro Sakakibara; Marcin Konczykowski; Silvia Seiro; Hirale S. Jeevan; Christoph Geibel; Carsten Putzke; Takafumi Onishi; Hiroaki Ikeda; Antony Carrington; Takasada Shibauchi; Yuji Matsuda

doi:10.1126/sciadv.1601667

Research ArticlePHYSICS

Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu₂Si₂

Takuya Yamashita¹,*,
Takaaki Takenaka²,*,
Yoshifumi Tokiwa¹,*,
Joseph A. Wilcox³,*,
Yuta Mizukami²,
Daiki Terazawa¹,
Yuichi Kasahara¹,
Shunichiro Kittaka⁴,
Toshiro Sakakibara⁴,
Marcin Konczykowski⁵,
Silvia Seiro⁶,
View ORCID ProfileHirale S. Jeevan⁶,
Christoph Geibel⁶,
View ORCID ProfileCarsten Putzke³,
Takafumi Onishi¹,
Hiroaki Ikeda⁷,
Antony Carrington³,†,
Takasada Shibauchi²,† and
Yuji Matsuda¹,†

¹Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
²Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.
³H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.
⁴Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
⁵Laboratoire des Solides Irradiés, École Polytechnique, CNRS, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, 91128 Palaiseau Cedex, France.
⁶Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.
⁷Department of Physics, Ritsumeikan University, Kusatsu 525-8577, Japan.

↵†Corresponding author. Email: a.carrington{at}bristol.ac.uk (A.C.); shibauchi{at}k.u-tokyo.ac.jp (T.S.); matsuda{at}scphys.kyoto-u.ac.jp (Y.M.)

↵* These authors contributed equally to this work.

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Science Advances 23 Jun 2017:
Vol. 3, no. 6, e1601667
DOI: 10.1126/sciadv.1601667

Takuya Yamashita

1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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Takaaki Takenaka

2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.

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Yoshifumi Tokiwa

1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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Joseph A. Wilcox

3H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.

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Yuta Mizukami

2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.

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Daiki Terazawa

1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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Yuichi Kasahara

1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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Shunichiro Kittaka

4Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

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Toshiro Sakakibara

4Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

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Marcin Konczykowski

5Laboratoire des Solides Irradiés, École Polytechnique, CNRS, Commissariat à l’Energie Atomique et aux Energies Alternatives, Université Paris-Saclay, 91128 Palaiseau Cedex, France.

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Silvia Seiro

6Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.

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Hirale S. Jeevan

6Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.

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ORCID record for Hirale S. Jeevan

Christoph Geibel

6Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany.

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Carsten Putzke

3H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.

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Takafumi Onishi

1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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Hiroaki Ikeda

7Department of Physics, Ritsumeikan University, Kusatsu 525-8577, Japan.

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Antony Carrington

3H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK.

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For correspondence: a.carrington@bristol.ac.uk shibauchi@k.u-tokyo.ac.jp matsuda@scphys.kyoto-u.ac.jp

Takasada Shibauchi

2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan.

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For correspondence: a.carrington@bristol.ac.uk shibauchi@k.u-tokyo.ac.jp matsuda@scphys.kyoto-u.ac.jp

Yuji Matsuda

1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

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For correspondence: a.carrington@bristol.ac.uk shibauchi@k.u-tokyo.ac.jp matsuda@scphys.kyoto-u.ac.jp

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