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Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C9H18N2CuBr4

Author

Listed:
  • Tao Hong

    (Oak Ridge National Laboratory)

  • Tao Ying

    (Harbin Institute of Technology)

  • Qing Huang

    (University of Tennessee)

  • Sachith E. Dissanayake

    (University of Rochester)

  • Yiming Qiu

    (National Institute of Standards and Technology)

  • Mark M. Turnbull

    (Clark University)

  • Andrey A. Podlesnyak

    (Oak Ridge National Laboratory)

  • Yan Wu

    (Oak Ridge National Laboratory)

  • Huibo Cao

    (Oak Ridge National Laboratory)

  • Yaohua Liu

    (Oak Ridge National Laboratory
    Oak Ridge National Laboratory)

  • Izuru Umehara

    (Yokohama National University)

  • Jun Gouchi

    (University of Tokyo)

  • Yoshiya Uwatoko

    (University of Tokyo)

  • Masaaki Matsuda

    (Oak Ridge National Laboratory)

  • David A. Tennant

    (University of Tennessee
    University of Tennessee)

  • Gia-Wei Chern

    (University of Virginia)

  • Kai P. Schmidt

    (Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg)

  • Stefan Wessel

    (JARA-FIT and JARA-HPC, RWTH Aachen University)

Abstract

Quantum phase transitions in quantum matter occur at zero temperature between distinct ground states by tuning a nonthermal control parameter. Often, they can be accurately described within the Landau theory of phase transitions, similarly to conventional thermal phase transitions. However, this picture can break down under certain circumstances. Here, we present a comprehensive study of the effect of hydrostatic pressure on the magnetic structure and spin dynamics of the spin-1/2 ladder compound C9H18N2CuBr4. Single-crystal heat capacity and neutron diffraction measurements reveal that the Néel-ordered phase breaks down beyond a critical pressure of Pc ∼ 1.0 GPa through a continuous quantum phase transition. Estimates of the critical exponents suggest that this transition may fall outside the traditional Landau paradigm. The inelastic neutron scattering spectra at 1.3 GPa are characterized by two well-separated gapped modes, including one continuum-like and another resolution-limited excitation in distinct scattering channels, which further indicates an exotic quantum-disordered phase above Pc.

Suggested Citation

  • Tao Hong & Tao Ying & Qing Huang & Sachith E. Dissanayake & Yiming Qiu & Mark M. Turnbull & Andrey A. Podlesnyak & Yan Wu & Huibo Cao & Yaohua Liu & Izuru Umehara & Jun Gouchi & Yoshiya Uwatoko & Masa, 2022. "Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C9H18N2CuBr4," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30769-8
    DOI: 10.1038/s41467-022-30769-8
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    References listed on IDEAS

    as
    1. Tao Hong & Y. Qiu & M. Matsumoto & D. A. Tennant & K. Coester & K. P. Schmidt & F. F. Awwadi & M. M. Turnbull & H. Agrawal & A. L. Chernyshev, 2017. "Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet," Nature Communications, Nature, vol. 8(1), pages 1-8, August.
    2. Seung-Hwan Do & Hao Zhang & Travis J. Williams & Tao Hong & V. Ovidiu Garlea & J. A. Rodriguez-Rivera & Tae-Hwan Jang & Sang-Wook Cheong & Jae-Hoon Park & Cristian D. Batista & Andrew D. Christianson, 2021. "Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet," Nature Communications, Nature, vol. 12(1), pages 1-12, December.
    3. Matthew B. Stone & Igor A. Zaliznyak & Tao Hong & Collin L. Broholm & Daniel H. Reich, 2006. "Quasiparticle breakdown in a quantum spin liquid," Nature, Nature, vol. 440(7081), pages 187-190, March.
    4. Leon Balents, 2010. "Spin liquids in frustrated magnets," Nature, Nature, vol. 464(7286), pages 199-208, March.
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    Cited by:

    1. Kirill Yu. Povarov & David E. Graf & Andreas Hauspurg & Sergei Zherlitsyn & Joachim Wosnitza & Takahiro Sakurai & Hitoshi Ohta & Shojiro Kimura & Hiroyuki Nojiri & V. Ovidiu Garlea & Andrey Zheludev &, 2024. "Pressure-tuned quantum criticality in the large-D antiferromagnet DTN," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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