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    Quantum-critical scale invariance in a transition metal alloy

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    External Link(s)
    https://doi.org/10.1038/s42005-020-00448-5
    Date
    2020-10-15
    Author
    Nakajima, Yasuyuki
    Metz, Tristin
    Eckberg, Christopher
    Kirshenbaum, Kevin
    Hughes, Alex
    Wang, Renxiong
    Wang, Limin
    Saha, Shanta R.
    Liu, I-Lin
    Butch, Nicholas P.
    Campbell, Daniel
    Eo, Yun Suk
    Graf, David
    Liu, Zhonghao
    Borisenko, Sergey V.
    Zavalij, Peter Y.
    Paglione, Johnpierre
    Citation
    Nakajima, Y., Metz, T., Eckberg, C. et al. Quantum-critical scale invariance in a transition metal alloy. Commun Phys 3, 181 (2020).
    DRUM DOI
    https://doi.org/10.13016/8r0b-re3a
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    Abstract
    Quantum-mechanical fluctuations between competing phases induce exotic collective excitations that exhibit anomalous behavior in transport and thermodynamic properties, and are often intimately linked to the appearance of unconventional Cooper pairing. High-temperature superconductivity, however, makes it difficult to assess the role of quantum-critical fluctuations in shaping anomalous finite-temperature physical properties. Here we report temperature-field scale invariance of non-Fermi liquid thermodynamic, transport, and Hall quantities in a non-superconducting iron-pnictide, Ba(Fe1/3Co1/3Ni1/3)2As2, indicative of quantum criticality at zero temperature and applied magnetic field. Beyond a linear-in-temperature resistivity, the hallmark signature of strong quasiparticle scattering, we find a scattering rate that obeys a universal scaling relation between temperature and applied magnetic fields down to the lowest energy scales. Together with the dominance of hole-like carriers close to the zero-temperature and zero-field limits, the scale invariance, isotropic field response, and lack of applied pressure sensitivity suggests a unique quantum critical system unhindered by a pairing instability.
    Notes
    Partial funding for Open Access provided by the UMD Libraries' Open Access Publishing Fund.
    URI
    http://hdl.handle.net/1903/27497
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    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
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