Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Frustrated Magnets: Strong Spin-Orbit Coupling I
TT 49.7: Vortrag
Mittwoch, 20. März 2024, 16:45–17:00, H 2053
Field and polarization dependent quantum spin dynamics in the honeycomb magnet Na2Co2TeO6: Magnetic excitations and continuum — •Patrick Pilch1, Laur Peedu2, Anup Kumar Bera3, Seikh Mohammad Yusuf3,4, Urmas Nagel2, Toomas Rõõm2, and Zhe Wang1 — 1Department of Physics, TU Dortmund University, Dortmund, Germany — 2National Institute of Chemical Physics and Biophysics, Tallinn, Estonia — 3Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, India — 4Homi Bhabha National Institute, Anushaktinagar, Mumbai, India
We report terahertz spectroscopic measurements of quantum spin dynamics in the spin-1/2 honeycomb magnet Na2Co2TeO6 as a function of applied magnetic field with different terahertz polarizations [1]. Distinct field dependencies of the resolved spin dynamics are identified in three regimes, which are separated by two critical fields at Bc1≈ 7 and Bc2≈ 10 T. A polarization selective continuum is observed in the intermediate phase, featuring spin fluctuations of a proximate quantum spin liquid.
[1] Pilch et al., Phys. Rev. B 108, L140406 (2023)
Keywords: Quantum spin liquid; 2D Honeycomb magnet; Terahertz spectroscopy; Spin excitations