THz spectroscopy of one-dimensional Ising chain compound CoNb$_2$O$_6$ near the quantum critical point

ORAL

Abstract

One-dimensional Ising spin chain is a novel example of an interacting quantum many body system. The Ising chain in a transverse field is a good candidate to study quantum phase transitions because its low dimensionality increases its tendency to exhibit interesting quantum effects. We studied the one-dimensional ferromagnetic Ising chain material CoNb$_2$O$_6$ using far infrared spectroscopy in high magnetic fields up to 17\,T and down to 0.3\,K using a dilution refrigerator. Special attention is paid to the spectral region near the quantum critical point near 5.5\,T.

*Research sponsored by the Estonian Ministry of Education and Research (IUT23-3) and Estonian Ministry of Education and Research and the European Regional Development Fund project TK134.

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Authors

  • Johan Viirok

    • National Institute of Chemical Physics and Biophysics, Tallinn, Estonia

  • D. H{\"{u}}vonen

    • National Institute of Chemical Physics and Biophysics, Tallinn, Estonia

  • T. R{\~o}{\~o}m

    • National Institute of Chemical Physics and Biophysics, Tallinn, Estonia

  • U. Nagel

    • National Institute of Chemical Physics and Biophysics, Tallinn, Estonia

  • C. M. Morris

    • The Johns Hopkins University, Maryland

  • S. M. Koohpayeh

    • The Johns Hopkins University, Maryland

  • T. M. McQueen

    • The Johns Hopkins University, Maryland

  • N. P. Armitage

    • The Johns Hopkins University, Maryland

  • J. Krizan

    • Princeton University, New Jersey

  • R. J. Cava

    • Princeton University, New Jersey