Probing the magnetic excitations in the quantum magnet Yb2Ti2O7

ORAL

Abstract

The pyrochlore magnet Yb2Ti2O7 has shown exotic magnetic properties and has been considered to be a quantum spin ice although there is still considerable uncertainty about its Hamiltonian parameters. We study the evolution of its magnetic excitations as function of magnetic field and temperature using time-domain THz spectroscopy. We perform a thorough sum rule analysis of the low energy excitations by combining time domain terahertz spectroscopy and magnetization measurements. The distribution of spectral intensity indicates strong quantum fluctuations and short range spin correlations in Yb2Ti2O7 at low magnetic field. It also shows the very different manifestation of thermal fluctuations vs. quantum fluctuations in this compound.

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Presenters

  • Xinshu Zhang

    Johns Hopkins University

Authors

  • Xinshu Zhang

    Johns Hopkins University

  • Steffen Säubert

    Technische Universität München

  • Seyed Koohpayeh

    Johns Hopkins, Johns Hopkins University, Institute for Quantum Matter, Johns Hopkins University, Henry A. Rowland Department of Physics and Astronomy, Johns Hopkins University

  • Peter Armitage

    Johns Hopkins University, Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD, United States, Department of Physics and Astronomy, Johns Hopkins University