%0 Journal Article %1 Povarov2024 %A Povarov, Kirill Yu. %A Graf, David E. %A Hauspurg, Andreas %A Zherlitsyn, Sergei %A Wosnitza, Joachim %A Sakurai, Takahiro %A Ohta, Hitoshi %A Kimura, Shojiro %A Nojiri, Hiroyuki %A Garlea, V. Ovidiu %A Zheludev, Andrey %A Paduan-Filho, Armando %A Nicklas, Michael %A Zvyagin, Sergei A. %D 2024 %J Nat. Commun %K b %N 1 %P 2295 %R 10.1038/s41467-024-46527-x %T Pressure-tuned quantum criticality in the large-D antiferromagnet DTN %U https://doi.org/10.1038/s41467-024-46527-x %V 15 %X 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 zþinspace=þinspace1 or zþinspace=þinspace2 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 NiCl2þinspace⋅þinspace4SC(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 zþinspace=þinspace1 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.

@article{Povarov2024, 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{\thinspace}={\thinspace}1 or z{\thinspace}={\thinspace}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{\thinspace}⋅{\thinspace}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{\thinspace}={\thinspace}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.}, added-at = {2024-03-18T11:23:31.000+0100}, author = {Povarov, Kirill Yu. and Graf, David E. and Hauspurg, Andreas and Zherlitsyn, Sergei and Wosnitza, Joachim and Sakurai, Takahiro and Ohta, Hitoshi and Kimura, Shojiro and Nojiri, Hiroyuki and Garlea, V. Ovidiu and Zheludev, Andrey and Paduan-Filho, Armando and Nicklas, Michael and Zvyagin, Sergei A.}, biburl = {https://www.bibsonomy.org/bibtex/2c4dfab290ec1907ef9b0fa7f22bafc1a/ctqmat}, day = 14, description = {Pressure-tuned quantum criticality in the large-D antiferromagnet DTN | Nature Communications}, doi = {10.1038/s41467-024-46527-x}, interhash = {f861a3d8b3fe64a0d90b36aea503147b}, intrahash = {c4dfab290ec1907ef9b0fa7f22bafc1a}, issn = {2041-1723}, journal = {Nat. Commun}, keywords = {b}, month = {03}, number = 1, pages = 2295, timestamp = {2024-03-18T11:23:31.000+0100}, title = {Pressure-tuned quantum criticality in the large-D antiferromagnet DTN}, url = {https://doi.org/10.1038/s41467-024-46527-x}, volume = 15, year = 2024 }