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

Povarov, K.Y.; Graf, D.E.; Hauspurg, A.; Zherlitsyn, S.; Wosnitza, J.; Sakurai, T.; Ohta, H.; Kimura, S.; Nojiri, H.; Garlea, V.O.; Zheludev, A.; Paduan-Filho, A.; Nicklas, Michael; Zvyagin, S.A.

doi:10.1038/s41467-024-46527-x

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

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Nicklas, Michael
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Povarov, K., Graf, D., Hauspurg, A., Zherlitsyn, S., Wosnitza, J., Sakurai, T., et al. (2024). Pressure-tuned quantum criticality in the large-D antiferromagnet DTN. Nature Communications, 15: 2295, pp. 1-8. doi:10.1038/s41467-024-46527-x.

Cite as: https://hdl.handle.net/21.11116/0000-000F-3C60-2

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. © The Author(s) 2024.