Field-Induced Suppression of the Heavy-Fermion State in YbRh2Si2

Y. Tokiwa, P. Gegenwart, T. Radu, J. Ferstl, G. Sparn, C. Geibel, and F. Steglich
Phys. Rev. Lett. 94, 226402 – Published 6 June 2005

Abstract

We report dc-magnetization measurements on YbRh2Si2 at temperatures down to 0.04 K, magnetic fields B11.5T, and under hydrostatic pressure P1.3GPa. At ambient pressure a kink at B=9.9T indicates a new type of field-induced transition from an itinerant to a localized 4f state. This transition is different from the metamagnetic transition observed in other heavy-fermion compounds, as here ferromagnetic rather than antiferromagnetic correlations dominate below B. Hydrostatic pressure experiments reveal a clear correspondence of B to the characteristic spin fluctuation temperature determined from specific heat.

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  • Received 7 December 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.226402

©2005 American Physical Society

Authors & Affiliations

Y. Tokiwa, P. Gegenwart, T. Radu, J. Ferstl, G. Sparn, C. Geibel, and F. Steglich

  • Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

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Issue

Vol. 94, Iss. 22 — 10 June 2005

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