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Session Y2: Invited Session: Magnetism and non-Fermi Liquid in Heavy Fermion Metals

8:00 AM–11:00 AM, Friday, March 22, 2013
Room: Ballroom II

Sponsoring Unit: DCMP
Chair: Piers Coleman, Rutgers University

Abstract ID: BAPS.2013.MAR.Y2.2

Abstract: Y2.00002 : From incommensurate correlations to mesoscopic spin resonance in YbRh2Si2*

8:36 AM–9:12 AM

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Author:

Collin Broholm
(Institute for Quantum Matter and Department of Physics and Astronomy, Johns Hopkins University)

Spin fluctuations are reported near the magnetic field driven quantum critical point in YbRh2Si2 [1]. On cooling, ferromagnetic fluctuations evolve into incommensurate correlations with a characteristic in-plane wave vector of $q_m = (\delta,\delta)$ with $\delta=0.14 \pm 0.04$ r.l.u. At low temperatures, an in plane magnetic field induces a sharp intra doublet resonant excitation at an energy $g\mu_B\mu_0H$ with $g=3.8\pm 0.2$. The intensity is localized at the zone center and has a width in momentum space indicating precession of spin density extending $\xi = 6 \pm 2$ \AA\ beyond the 4f site.\\[4pt] [1] C. Stock, C. Broholm, F. Demmel, J. Van Duijn, J. W. Taylor, H.J. Kang, R. Hu, and C. Petrovic, Phys. Rev. Lett. {\bf 109}, 127201 (2012).

*Work at IQM was supported by DoE, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award DE-FG02-08ER46544.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.Y2.2