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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0019-D181-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-F95E-F
Genre: Journal Article

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 Creators:
Steglich, Frank1, Author              
Pfau, H.2, Author              
Lausberg, S.2, Author              
Hamann, Sandra2, Author              
Sun, Peijie3, Author
Stockert, Ulrike2, Author              
Brando, Manuel4, Author              
Friedemann, Sven3, Author
Krellner, Cornelius3, Author
Geibel, Christoph5, Author              
Wirth, Steffen6, Author              
Kirchner, Stefan7, Author              
Abrahams, Elihu3, Author
Si, Qimiao3, Author
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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 Abstract: 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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 Dates: 2014-06-09
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.7566/JPSJ.83.061001
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Title: JPS conference proceedings
  Abbreviation : J. Phys. Soc. Japan
Source Genre: Journal
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Publ. Info: Tokyo : The Physical Society of Japan
Pages: - Volume / Issue: 83 Sequence Number: 061001 Start / End Page: 1 - 8 Identifier: CoNE: /journals/resource/1