The interface between heavy fermions and normal electrons investigated by spatially-resolved nuclear magnetic resonance

Abstract

We have studied the superlattices with alternating block layers (BLs) of heavy-fermion superconductor CeCoIn5 and conventional-metal YbCoIn5 by site-selective nuclear magnetic resonance(NMR) spectroscopy, which uniquely offers spatially-resolved dynamical magnetic information. We find that the presence of antiferromagnetic fluctuations is confined to the Ce-BLs, indicating that magnetic degrees of freedom of f-electrons are quenched inside the Yb-BLs. Contrary to simple expectations that the two-dimensionalization enhances fluctuations, we observe that antiferromagnetic fluctuations are rapidly suppressed with decreasing Ce-BL thickness. Moreover, the suppression is more prominent near the interfaces between the BLs. These results imply significant effects of local inversion-symmetry breaking at the interfaces.

5 pages, 4 figures, accepted for publication as a Rapid Communication in Physical Review B

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• Tuning of magnetic quantum criticality in artificial Kondo superlattice CeRhIn5/YbRhIn5
• In Situ STM Observation of Nonmagnetic Impurity Effect in MBE-grown CeCoIn${}_5$ Films
• Robust zero-energy bound states around a pair-density-wave vortex core in locally noncentrosymmetric superconductors
• Controlling unconventional superconductivity in artificially engineered $f$-electron Kondo superlattices
• Topological d-wave superconductivity in two dimensions
• Tuning the pairing interaction in a $d$-wave superconductor by paramagnons injected through interfaces
• Direct Evidence for the Existence of Heavy Quasiparticles in the Magnetically Ordered Phase of CeRhIn${}_5$
• Evolution of the metallic state of LaNiO${}_3$/LaAlO${}_3$ superlattices measured by ${}^8$Li $\beta$-detected NMR
• Modification of magnetic fluctuations by interfacial interactions in artificially engineered heavy-fermion superlattices
• Coupling between heavy fermion superconductor CeCoIn${}_5$ and antiferromagnetic metal CeIn${}_3$ through the atomic interface
• Magnetic and superconducting properties of the heavy-fermion CeCoIn5 epitaxial film probed by nuclear quadrupole resonance