Tuning the Pairing Interaction in a -Wave Superconductor by Paramagnons Injected through Interfaces
- Kyoto Univ. (Japan). Dept. of Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Kyoto Univ. (Japan). Dept. of Physics; Univ. of Augsburg (Germany). Center for Electronic Correlations and Magnetism. Inst. of Physics
- 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 Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Society for the Promotion of Science (JSPS)
- Grant/Contract Number:
- AC52-06NA25396; 25220710; 15H02014; 15H02106; 15H05457; JP15H05852; 26105004
- OSTI ID:
- 1441308
- Alternate ID(s):
- OSTI ID: 1435991
- Report Number(s):
- LA-UR-17-28530; TRN: US1900889
- Journal Information:
- Physical Review Letters, Vol. 120, Issue 18; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Anti-PbO-type CoSe film: a possible analog to FeSe superconductors
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journal | October 2018 |
Coupling between the heavy-fermion superconductor and the antiferromagnetic metal through the atomic interface
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journal | July 2019 |
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