Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Molecular Magnetism
MA 6.9: Vortrag
Montag, 18. März 2024, 12:00–12:15, EB 301
Pressure-induced ordering in a highly symmetric quantum magnet DTN — •Kirill Povarov1, David Graf2, Andreas Hauspurg1,3, Sergei Zherlitsyn1, Joachim Wosnitza1,3, Takahiro Sakurai4, Hitoshi Ohta5,6, Shojiro Kimura7, Hiroyuki Nojiri7, Ovidiu Garlea8, Andrey Zheludev9, Armando Paduan-Filho10, Michael Nicklas11, and Sergei Zvyagin1 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden — 2National High Magnetic Field Laboratory, Tallahassee — 3Institut für Festkörper- und Materialphysik, TU Dresden — 4Research Facility Center for Science and Technology, Kobe U. — 5Molecular Photoscience Research Center, Kobe U. — 6Graduate School of Science, Kobe U. — 7Institute for Materials Research, Tohoku U. — 8Neutron Scattering Division, ORNL — 9Laboratory for Solid State Physics, ETH Zürich — 10Instituto de Fisica, U. de São Paulo — 11Max Planck Institute for Chemical Physics of Solids
We experimentally demonstrate the pressure-induced ordering in the model tetragonal S=1 quantum paramagnet NiCl2·4SC(NH2)2 (DTN). Employing TDO susceptibility and ultrasound techniques, we show that the spin gap vanishes and the magnetic order appears at a critical pressure Pc=4.2(3) kbar. Powder neutron diffraction reveals undistorted tetragonal symmetry at the magnetic criticality. We describe the obtained critical fields employing linear spin-wave theory and a quasi-1D numeric approximation, circumventing the quantum renormalization effects for spin-Hamiltonian parameteres. The studies are complemented by high-pressure ESR measurements.
Keywords: Quantum Magnetism; Quantum Phase Transitions; Pressure-induced Ordering