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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 Yusuf^3,4, 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 B_c1≈ 7 and B_c2≈ 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