Disorder, inhomogeneity and spin dynamics in f-electron non-Fermi liquid systems

Abstract

Muon spin rotation and relaxation ($\mu$SR) experiments have yielded evidence that structural disorder is an important factor in many f-electron-based non-Fermi-liquid (NFL) systems. Disorder-driven mechanisms for NFL behaviour are suggested by the observed broad and strongly temperature-dependent $\mu$SR (and NMR) linewidths in several NFL compounds and alloys. Local disorder-driven theories (Kondo disorder, Griffiths-McCoy singularity) are, however, not capable of describing the time-field scaling seen in muon spin relaxation experiments, which suggest cooperative and critical spin fluctuations rather than a distribution of local fluctuation rates. A strong empirical correlation is established between electronic disorder and slow spin fluctuations in NFL materials

24 pages, 15 figures, submitted to J. Phys.: Condens. Matter

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• Effective model of the electronic Griffiths phase
• Spin Liquid Behavior in Electronic Griffiths Phases
• Magnetic order and spin dynamics in the proximity of a ferromagnetic quantum critical point: A μSR study of YbNi4P2
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• Magnetic order and spin dynamics across a ferromagnetic quantum critical point: $\mu$SR investigations of YbNi${}_4$(P${}_{1-x}$As${}_x$)${}_2$
• Zero-Field Ambient-Pressure Quantum Criticality in the Stoichiometric Non-Fermi Liquid System CeRhBi
• Probing the magnetic phases in the Ni-V alloy close to the disordered ferromagnetic quantum critical point with muSR
• Frustration-induced quantum criticality in Ni-doped CePdAl as revealed by the $\mu$SR technique
• Evolution of quantum criticality in the system CeNi9Ge4
• Quantum Griffiths singularity in the stoichiometric heavy-fermion system CeRh${}_4$Al${}_{15}$
• Effect of annealing on glassy dynamics and non-Fermi liquid behavior in UCu_4Pd
• Magnetic transition and spin fluctuations in the unconventional antiferromagnetic compound Yb3Pt4