Divergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh$_2$Si$_2$

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dc.creatorTokiwa, Y.
dc.creatorRadu, T.
dc.creatorGegenwart, P.
dc.creatorGeibel, C.
dc.creatorSteglich, F.
dc.date2008-09-22
dc.date2008-11-26
dc.date.accessioned2026-07-07T12:41:28Z
dc.date.available2026-07-07T12:41:28Z
dc.descriptionThe heavy fermion compound YbRh$_2$Si$_2$ is studied by low-temperature magnetization $M(T)$ and specific-heat $C(T)$ measurements at magnetic fields close to the quantum critical point ($H_c=0.06$ T, $H\perp c$). Upon approaching the instability, $dM/dT$ is more singular than $C(T)$, leading to a divergence of the magnetic Grüneisen ratio $Γ_{\rm mag}=-(dM/dT)/C$. Within the Fermi liquid regime, $Γ_{\rm mag}=-G_r(H-H_c^{fit})$ with $G_r=-0.30\pm 0.01$ and $H_c^{fit}=(0.065\pm 0.005)$ T which is consistent with scaling behavior of the specific-heat coefficient in YbRh$_2$(Si$_{0.95}$Ge$_{0.05}$)$_2$. The field-dependence of $dM/dT$ indicates an inflection point of the entropy as a function of magnetic field upon passing the line $T^\star(H)$ previously observed in Hall- and thermodynamic measurements.
dc.description4 pages, 3 Figures
dc.identifierhttps://arxiv.org/abs/0809.3705
dc.identifierhttp://arxiv.org/abs/0809.3705
dc.identifierPhys. Rev. Lett. 102, 066401 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.066401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219779
dc.subjectStrongly Correlated Electrons
dc.titleDivergence of the Magnetic Grüneisen Ratio at the Field-Induced Quantum Critical Point in YbRh$_2$Si$_2$
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