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

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.
Authors:
 [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
Publication Date:
Report Number(s):
LA-UR-17-28530
Journal ID: ISSN 0031-9007
Grant/Contract Number:
AC52-06NA25396; 25220710; 15H02014; 15H02106; 15H05457; JP15H05852; 26105004
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 120; Journal Issue: 18; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Japan Society for the Promotion of Science (JSPS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science; superconductivity, heavy fermion, heterostructure
OSTI Identifier:
1441308
Alternate Identifier(s):
OSTI ID: 1435991