Site Specific Knight Shift Measurements of the Dilute Kondo lattice System Ce${}_{1-x}$La${}_x$CoIn${}_5$

Abstract

${}^{115}$In Nuclear magnetic resonance data are presented for a series of Ce${}_{1-x}$La${}_x$CoIn${}_5$ crystals with different La dilutions, $x$. Multiple In(1) sites associated with different numbers of nearest-neighbor cerium atoms exhibit different Knight shifts and spin lattice relaxation rates. Analysis of the temperature dependence of these sites reveals both an evolution of the heavy electron coherence as a function of dilution, as well as spatial inhomogeneity associated with a complete suppression of antiferromagnetic fluctuations in the vicinity of the La sites. Quantum critical fluctuations persist within disconnected Ce clusters with dilution levels up to 75%, despite the fact that specific heat shows Fermi liquid behavior in dilute samples.

9 pages, 10 figures

References in corpus (11)

• Quantum criticality
• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Visualizing heavy fermions emerging in a quantum critical Kondo lattice
• Universal Behavior in Heavy Electron Materials
• Interacting Antiferromagnetic Droplets in Quantum Critical CeCoIn_5
• Disorder in a Quantum Critical Superconductor
• Long range order and two-fluid behavior in heavy electron materials
• Nuclear magnetic resonance in the heavy fermion superconductors
• Coherence scale of coupled Anderson impurities
• Universal Knight shift anomaly in the Periodic Anderson model
• Magnetic excitations in Kondo liquid: Superconductivity and Hidden Magnetic Quantum Critical Fluctuations