Pressure-Tuning through the <i>D</i>/<i>J</i> ≈ 1 Quantum Critical Point in an <i>S</i> = 1 Antiferromagnetic Chain

ORAL

Abstract

Properties of [Ni(HF2)(3-Clpy)4]BF4 (py = pyridine), or NBCT, suggest this S = 1 chain is near the D/J ≈ 1 quantum critical point with easy-plane anisotropy D = 4.3 K, intrachain antiferromagnetic interaction J = 4.86 K, and no long-range order to 25 mK [1]. To clarify other work [2], the low field (0.1 T) susceptibility χ(2 K < T < 300 K) was studied as a function of pressure (P < 1.5 GPa). These data are contrasted with isothermal (300 K) powder XRD studies made with P < 2.5 GPa. The pressure evolution of χ(T) correlates with structural modifications. With no evidence of a structural transition, the χ(T) data can be simulated by changes of J and D [3]. Complemented by inelastic neutron studies (P and B = 0 and T > 300 mK) [4], NBCT appears to be the first S = 1 antiferromagnetic chain that can be pressure-tuned from the Haldane phase to the Large-D regime by traversing the D/J ≈ 1 quantum critical point.
[1] J. L. Manson et al., Inorg. Chem. 51 (2012) 7520.
[2] J. S. Xia et al., J. Phys. Conf. Ser. 969 (2018) 012121.
[3] O. Trejo, E. Cizmar, M. W. Meisel, this meeting.
[4] D. M. Pajerowski et al., in preparation.

*NSF via DMR-1461019 (UF Physics REU for JMP), DMR-1644779 (NHMFL), DMR-1703003 (JLM), and DMR-1708410 (MWM). XRD at the APS-ANL DOE Contract DE-AC02-06CH11357.

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Presenters

  • Mark Meisel

    • Dept. of Physics and NHMFL, University of Florida
    • Dept. of Physics and National High Magnetic Field Laboratory, University of Florida
    • University of Florida

Authors

  • Marcus K. Peprah

    • Dept. of Physics and NHMFL, University of Florida

  • Paul S. Edwards

    • Dept. of Physics and NHMFL, University of Florida
    • University of North Florida

  • John Cain

    • Dept. of Chemistry, University of Florida

  • Orlando Trejo

    • Dept. of Physics and NHMFL, University of Florida

  • Jaynise M. Perez

    • Dept. of Physics and NHMFL, University of Florida

  • Pedro A. Quintero

    • Dept. of Physics and NHMFL, University of Florida

  • Jared B Singleton

    • Dept. of Physics and Astronomy, Francis Marion University, SC

  • Larry Paul Engelhardt

    • Dept. of Physics and Astronomy, Francis Marion University, SC

  • Saul H. Lapidus

    • Advanced Photon Source, Argonne National Laboratory
    • X-ray Science Division, Argonne National Laboratory
    • Advanced Photon Source, Argonne Natl Lab

  • Erik Cizmar

    • Dept. of Condensed Matter Physics, Institute of Physics, P. J. Šafárik University, Košice, Slovakia
    • Dept. of Condensed matter, Institute of Physics, P.J. Šafárik University

  • Jamie Manson

    • Chemistry, Eastern Washington University
    • Dept. of Chemistry and Biochemistry, Eastern Washington University
    • Eastern Washington University
    • Department of Chemistry and Biochemistry, Eastern Washington University

  • Mark Meisel

    • Dept. of Physics and NHMFL, University of Florida
    • Dept. of Physics and National High Magnetic Field Laboratory, University of Florida
    • University of Florida