Evidence of a Kondo Destroying Quantum Critical Point in YbRh2Si2

Steglich, Frank; Pfau, Heike; Lausberg, Stefan; Hamann, Sandra; Sun, Peijie; Stockert, Ulrike; Brando, Manuel; Friedemann, Sven; Krellner, Cornelius; Geibel, Christoph; Wirth, Steffen; Kirchner, Stefan; Abrahams, Elihu; Si, Qimiao

doi:10.7566/JPSJ.83.061001

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Evidence of a Kondo Destroying Quantum Critical Point in YbRh₂Si₂

MPG-Autoren

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Steglich, Frank
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Pfau, Heike
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126723

Lausberg, Stefan
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hamann, Sandra
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Stockert, Ulrike
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Brando, Manuel
Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Geibel, Christoph
Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wirth, Steffen
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kirchner, Stefan
Stefan Kirchner, cross-PKS/CPfS theory group, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Steglich, F., Pfau, H., Lausberg, S., Hamann, S., Sun, P., Stockert, U., et al. (2014). Evidence of a Kondo Destroying Quantum Critical Point in YbRh₂Si₂. JPS conference proceedings, 83: 061001, pp. 1-8. doi:10.7566/JPSJ.83.061001.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0019-D181-8

Zusammenfassung

The heavy-fermion metal YbRh2Si2 is a weak antiferromagnet below TN = 0.07 K. Application of a low magnetic field Bc = 0.06 T (⊥c) is sufficient to continuously suppress the antiferromagnetic (AF) order. Below T ≈ 10 K, the Sommerfeld coefficient of the electronic specific heat γ(T) exhibits a logarithmic divergence. At T < 0.3 K, γ(T) ∼ T−ε (ε: 0.3–0.4), while the electrical resistivity ρ(T) = ρ0 + aT (ρ0: residual resistivity). Upon extrapolating finite-T data of transport and thermodynamic quantities to T = 0, one observes (i) a vanishing of the “Fermi surface crossover” scale T∗(B), (ii) an abrupt jump of the initial Hall coefficient RH(B) and (iii) a violation of the Wiedemann Franz law at B = Bc, the field-induced quantum critical point (QCP). These observations are interpreted as evidence of a critical destruction of the heavy quasiparticles, i.e., propagating Kondo singlets, at the QCP of this material.