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

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [1];  [3];  [1];  [1];  [1];  [4];  [2];  [2];  [1]
  1. Kyoto Univ. (Japan). Dept. of Physics
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Kyoto Univ. (Japan). Dept. of Physics; Univ. of Augsburg (Germany). Center for Electronic Correlations and Magnetism. Inst. of Physics
  4. Univ. of Tokyo (Japan). Dept. of Advanced Materials Science
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. In this paper, we fabricate hybrid superlattices consisting of alternating atomic layers of the heavy-fermion superconductor $${\mathrm{CeCoIn}}_{5}$$ and antiferromagnetic (AFM) metal $${\mathrm{CeRhIn}}_{5}$$, 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. Finally, this demonstrates that superconducting pairing can be tuned nontrivially by magnetic fluctuations (paramagnons) injected through the interface.
Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
Japan Society for the Promotion of Science (JSPS); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1441308
Alternate ID(s):
OSTI ID: 1435991
Report Number(s):
LA-UR-17-28530
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 120; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Anti-PbO-type CoSe film: a possible analog to FeSe superconductors journal October 2018
Coupling between the heavy-fermion superconductor CeCoIn 5 and the antiferromagnetic metal CeIn 3 through the atomic interface journal July 2019

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