THz Spectroscopy of the Quantum Criticality in a Transverse Field Ising Chain Compound CoNb2O6

ORAL

Abstract

The one-dimensional Ising chain in a transverse magnetic field is an ideal example of a system that undergoes an order-disorder transition at a quantum critical point. The columbite CoNb2O6 has been proposed as a good model system of the transverse field Ising chain allowing us to investigate the finite-temperature effects on quantum fluctuations near it’s quantum critical point. We studied the Ising chain material CoNb2O6 using THz spectroscopy in high magnetic fields up to 17T and down to 0.1K. The system shows a softening of the spectrum as one approaches the quantum critical point at about 5.5T from the ferromagnetic side. This collapse of energy scales is compared to predictions for quantum criticality in the 1D Ising model tuned by transverse field.

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Presenters

  • Johan Viirok

    National Institute of Chemical Physics & Biophysics, National Institute of Chemical Physics and Biophysics

Authors

  • Johan Viirok

    National Institute of Chemical Physics & Biophysics, National Institute of Chemical Physics and Biophysics

  • Dan Hüvonen

    National Institute of Chemical Physics and Biophysics

  • Toomas Room

    National Institute of Chemical Physics & Biophysics, National Institute of Chemical Physics and Biophysics

  • Urmas Nagel

    National Institute of Chemical Physics & Biophysics, National Institute of Chemical Physics and Biophysics

  • Christopher Morris

    The Johns Hopkins University

  • Seyed Koohpayeh

    Johns Hopkins University, The Johns Hopkins University

  • Tyrel McQueen

    Johns Hopkins University, Institute for Quantum Matter, Johns Hopkins University, Department of Chemistry , Johns Hopkins University, The Johns Hopkins University

  • Peter Armitage

    Department of Physics and Astronomy, The Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins Unversity, Johns Hopkins University, Johns Hopkins Univ, Institute for Quantum Matter, Johns Hopkins University, The Johns Hopkins University

  • Jason Krizan

    Physics, Boston College, Princeton University

  • Robert Cava

    Department of Chemistry, Princeton University, Princeton, Princeton University, Chemistry, Princeton Univ, Princeton Univ