From incommensurate correlations to mesoscopic spin resonance in YbRh2Si2

Abstract

Spin fluctuations are reported near the magnetic field driven quantum critical point in YbRh2Si2. On cooling, ferromagnetic fluctuations evolve into incommensurate correlations located at q0=+/- (delta,delta) with delta=0.14 +/- 0.04 r.l.u. At low temperatures, an in plane magnetic field induces a sharp intra doublet resonant excitation at an energy E0=g muB mu0 H with g=3.8 +/- 0.2. The intensity is localized at the zone center indicating precession of spin density extending xi=6 +/- 2 A beyond the 4f site.

(main text - 4 pages, 4 figures; supplementary information - 3 pages, 3 figures; to be published in Physical Review Letters)

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• Fermi-liquid instabilities at magnetic quantum phase transitions
• Quantum Criticality in Heavy Fermion Metals
• Spin resonance in the d-wave superconductor CeCoIn5
• Fermi-surface collapse and dynamical scaling near a quantum critical point
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• Relevance of ferromagnetic correlations for the Electron Spin Resonance in Kondo lattice systems
• Electron spin resonance in Kondo systems
• Anisotropic critical magnetic fluctuations in the ferromagnetic superconductor UCoGe
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