Scale-Invariant transport near quantum critical point in high-temperature superconductors.

Invited

Abstract

The origin of the anomalous relaxation dynamics and the very nature of charge carriers in the "strange metal" state are among the most pressing open questions in copper and iron based superconductors. In this talk, I will review thermodynamic measurements that indicate the existence of quantum critical point in iron based superconductors, such as enhanced electronic correlations approaching critical doping as well as zero-temperature collapse of a line of phase transitions inside superconducting dome. Then I will discuss high-magnetic-field transport measurements near critical doping which highlight the dynamic consequences of quantum criticality such as scale invariant transport. In both classes of high temperature superconductors these measurements reveal a linear-in-field resistivity at very high magnetic fields (up to 93T) which exhibits a characteristic temperature-field competition as field is lowered. Such scale-invariant behavior of magneto-transport in a broad range of temperatures and magnetic fields is incompatible with quasiparticle transport in the strange metal state.

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Presenters

  • Arkady Shekhter

    Los Alamos National Laboratory, National High Magnetic Field Laboratory, NHMFL/FSU, DC Facility, Nationall High Magnetic Field Laboratory

Authors

  • Arkady Shekhter

    Los Alamos National Laboratory, National High Magnetic Field Laboratory, NHMFL/FSU, DC Facility, Nationall High Magnetic Field Laboratory

  • Laurel Winter

    Los Alamos National Laboratory, Los Alamos Natl Lab, LANL/NHMFL, NHMFL-PFF, Los Alamos National Laboratory, National High Magnetic Field Laboratory, LANL

  • Xiujun Lian

    National High Magnetic Field Laboratory, DC Facility, Nationall High Magnetic Field Laboratory

  • Kim Modic

    Max-Planck-Institute for Chemical Physics of Solids

  • Jonathan Betts

    Los Alamos National Laboratory, Los Alamos Natl Lab, NHMFL-PFF, Los Alamos National Laboratory, National High Magnetic Field Laboratory

  • Fedor Balakirev

    NHMFL at Los Alamos National Lab, NHMFL-PFF, Los Alamos National Laboratory, National High Magnetic Field Laboratory, LANL, National High Magnetic Field Laboratory

  • Shimpei Ono

    Central Research Institute of Electric Power Industry, Materials Science Research Laboratory, Central Research Institute of Electric Power Industry (CRIEPI)

  • Brad Ramshaw

    Cornell University, Los Alamos National Labs, National High Magnetic Field Laboratory, Department of Physics, Cornell University, Laboratory of Atomic and Solid State Physics, Cornell University, Los Alamos National Laboratory, Laboratory for Atomic and Solid state Physics, Cornell University

  • Gregory Boebinger

    DC Facility, Nationall High Magnetic Field Laboratory

  • Ross McDonald

    Los Alamos National Laboratory, National High Magnetic Field Laboratory, Pulsed Field Facility, Los Alamos National Lab, Los Alamos Natl Lab, LANL/NHMFL, NHMFL-PFF, Los Alamos National Laboratory, National High Magnetic Field Laboratory, LANL