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  Evidence of a Kondo Destroying Quantum Critical Point in YbRh2Si2

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.

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Steglich, Frank1, Autor           
Pfau, H.2, Autor           
Lausberg, S.2, Autor           
Hamann, Sandra2, Autor           
Sun, Peijie3, Autor
Stockert, Ulrike2, Autor           
Brando, Manuel4, Autor           
Friedemann, Sven3, Autor
Krellner, Cornelius3, Autor
Geibel, Christoph5, Autor           
Wirth, Steffen6, Autor           
Kirchner, Stefan7, Autor           
Abrahams, Elihu3, Autor
Si, Qimiao3, Autor
Affiliations:
1Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3External Organizations, ou_persistent22              
4Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863469              
5Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
6Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863460              
7Stefan Kirchner, cross-PKS/CPfS theory group, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863475              

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 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.

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 Datum: 2014-06-09
 Publikationsstatus: Erschienen
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 Identifikatoren: DOI: 10.7566/JPSJ.83.061001
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Titel: JPS conference proceedings
  Kurztitel : J. Phys. Soc. Japan
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Tokyo : The Physical Society of Japan
Seiten: - Band / Heft: 83 Artikelnummer: 061001 Start- / Endseite: 1 - 8 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/1