From Incommensurate Correlations to Mesoscopic Spin Resonance in YbRh2Si2

C Stock, C Broholm, F Demmel, J van Duijn, J Taylor, H Kang, R Hu, C Petrovic

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number127201
Number of pages5
JournalPhysical Review Letters
Volume109
Issue number12
DOIs
Publication statusPublished - 21 Sep 2012

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