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From Incommensurate Correlations to Mesoscopic Spin Resonance in $\mathrmYbRh_2\mathrmSi_2$

by: C. Stock, C. Broholm, F. Demmel, J. Van Duijn, J. W. Taylor, H. J. Kang, R. Hu, C. Petrovic
Physical Review Letters, Vol. 109 (Sep 2012), 127201, doi:10.1103/physrevlett.109.127201  Key: citeulike:11486536

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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=±(δ,δ), with δ=0.14±0.04  r.l.u. At low temperatures, an in-plane magnetic field induces a sharp intradoublet resonant excitation at an energy E0=gμBμ0H with g=3.8±0.2. The intensity is localized at the zone center, indicating precession of spin density extending ξ=6±2  Å beyond the 4f site.


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