Pressure-tuned quantum criticality in the large-D antiferromagnet DTN

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, Armando Paduan-Filho, Michael Nicklas and Sergei A. Zvyagin ()
Additional contact information
Kirill Yu. Povarov: Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
David E. Graf: National High Magnetic Field Laboratory
Andreas Hauspurg: Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
Sergei Zherlitsyn: Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
Joachim Wosnitza: Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
Takahiro Sakurai: Kobe University
Hitoshi Ohta: Kobe University
Shojiro Kimura: Tohoku University
Hiroyuki Nojiri: Tohoku University
V. Ovidiu Garlea: Oak Ridge National Laboratory
Andrey Zheludev: Laboratory for Solid State Physics
Armando Paduan-Filho: Universidade de São Paulo
Michael Nicklas: Max Planck Institute for Chemical Physics of Solids
Sergei A. Zvyagin: Helmholtz-Zentrum Dresden-Rossendorf (HZDR)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Strongly correlated spin systems can be driven to quantum critical points via various routes. In particular, gapped quantum antiferromagnets can undergo phase transitions into a magnetically ordered state with applied pressure or magnetic field, acting as tuning parameters. These transitions are characterized by z = 1 or z = 2 dynamical critical exponents, determined by the linear and quadratic low-energy dispersion of spin excitations, respectively. Employing high-frequency susceptibility and ultrasound techniques, we demonstrate that the tetragonal easy-plane quantum antiferromagnet NiCl2 ⋅ 4SC(NH2)2 (aka DTN) undergoes a spin-gap closure transition at about 4.2 kbar, resulting in a pressure-induced magnetic ordering. The studies are complemented by high-pressure-electron spin-resonance measurements confirming the proposed scenario. Powder neutron diffraction measurements revealed that no lattice distortion occurs at this pressure and the high spin symmetry is preserved, establishing DTN as a perfect platform to investigate z = 1 quantum critical phenomena. The experimental observations are supported by DMRG calculations, allowing us to quantitatively describe the pressure-driven evolution of critical fields and spin-Hamiltonian parameters in DTN.

Date: 2024
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DOI: 10.1038/s41467-024-46527-x

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