Tuning the Pairing Interaction in a d-Wave Superconductor by Paramagnons Injected through Interfaces

M. Naritsuka, P. F. S. Rosa, Yongkang Luo, Y. Kasahara, Y. Tokiwa, T. Ishii, S. Miyake, T. Terashima, T. Shibauchi, F. Ronning, J. D. Thompson, and Y. Matsuda
Phys. Rev. Lett. 120, 187002 – Published 4 May 2018
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Abstract

Unconventional superconductivity and magnetism are intertwined on a microscopic level in a wide class of materials. A new approach to this most fundamental and hotly debated issue focuses on the role of interactions between superconducting electrons and bosonic fluctuations at the interface between adjacent layers in heterostructures. Here we fabricate hybrid superlattices consisting of alternating atomic layers of the heavy-fermion superconductor CeCoIn5 and antiferromagnetic (AFM) metal CeRhIn5, in which the AFM order can be suppressed by applying pressure. We find that the superconducting and AFM states coexist in spatially separated layers, but their mutual coupling via the interface significantly modifies the superconducting properties. An analysis of upper critical fields reveals that, upon suppressing the AFM order by applied pressure, the force binding superconducting electron pairs acquires an extreme strong-coupling nature. This demonstrates that superconducting pairing can be tuned nontrivially by magnetic fluctuations (paramagnons) injected through the interface.

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  • Received 12 October 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.187002

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Naritsuka1, P. F. S. Rosa2, Yongkang Luo2, Y. Kasahara1, Y. Tokiwa1,3, T. Ishii1, S. Miyake1, T. Terashima1, T. Shibauchi4, F. Ronning2, J. D. Thompson2, and Y. Matsuda1

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 2Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA
  • 3Center for Electronic Correlations and Magnetism, Institute of Physics, Augsburg University, 86159 Augsburg, Germany
  • 4Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan

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Vol. 120, Iss. 18 — 4 May 2018

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