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Heat capacity peak at the quantum critical point of the transverse Ising magnet CoNb2O6

Author

Listed:
  • Tian Liang

    (Princeton University)

  • S. M. Koohpayeh

    (Institute for Quantum Matter, Johns Hopkins University)

  • J. W. Krizan

    (Princeton University)

  • T. M. McQueen

    (Institute for Quantum Matter, Johns Hopkins University
    Johns Hopkins University)

  • R. J. Cava

    (Princeton University)

  • N. P. Ong

    (Princeton University)

Abstract

The transverse Ising magnet Hamiltonian describing the Ising chain in a transverse magnetic field is the archetypal example of a system that undergoes a transition at a quantum critical point (QCP). The columbite CoNb2O6 is the closest realization of the transverse Ising magnet found to date. At low temperatures, neutron diffraction has observed a set of discrete collective spin modes near the QCP. Here, we ask if there are low-lying spin excitations distinct from these relatively high-energy modes. Using the heat capacity, we show that a significant band of gapless spin excitations exists. At the QCP, their spin entropy rises to a prominent peak that accounts for 30% of the total spin degrees of freedom. In a narrow field interval below the QCP, the gapless excitations display a fermion-like, temperature-linear heat capacity below 1 K. These novel gapless modes are the main spin excitations participating in, and affected by, the quantum transition.

Suggested Citation

  • Tian Liang & S. M. Koohpayeh & J. W. Krizan & T. M. McQueen & R. J. Cava & N. P. Ong, 2015. "Heat capacity peak at the quantum critical point of the transverse Ising magnet CoNb2O6," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8611
    DOI: 10.1038/ncomms8611
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    Cited by:

    1. Madalynn Marshall & Brianna R. Billingsley & Xiaojian Bai & Qianli Ma & Tai Kong & Huibo Cao, 2023. "Field-induced partial disorder in a Shastry-Sutherland lattice," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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