Heat capacity and magnetization of CoNb$_2$O$_6$ near quantum critical point

ORAL

Abstract

CoNb$_2$O$_6$ is a quasi-1D quantum magnet in which magnetic Co$^{2+}$ ions are ferromagnetically arranged into nearly isolated chains along the c axis with the magnetic moment confined in the ac-plane. By applying transverse magnetic field along b-axis, quantum phase transition from magnetically ordered phase to paramagnetic phase occurs. Evidence for emergent E$_8$ symmetry was recently obtained by neutron scattering near the quantum critical point (QCP) in an applied transverse magnetic field of 5.5 T We will report on experiments to investigate the behavior of the heat capacity and torque magnetization in the vicinity of the QCP and discuss their implications.

*Supported by NSF-DMR Grant 0819860 and the Office of Basic Energy Sciences (DOE) under Award DE-FG02-08ER46544

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Authors

  • Tian Liang

    • Department of Physics, Princeton University

  • Seyed Koohpayeh

    • Institute for Quantum Matter, Johns Hopkins University

  • Jason Krizan

    • Department of Chemistry, Princeton University

  • Sian Dutton

    • Princeton University
    • Department of Chemistry, Princeton University

  • Tyrel McQueen

    • Johns Hopkins University
    • Department of Physics and Astronomy, Johns Hopkins University

  • Robert Cava

    • Chemistry department, Princeton University
    • Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
    • Princeton University
    • Department of Chemistry, Princeton University

  • N. Phuan Ong

    • Department of Physics, Princeton University