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TT: Fachverband Tiefe Temperaturen

TT 41: Frustrated Magnets - Spin Liquids - Experiments

TT 41.10: Vortrag

Dienstag, 13. März 2018, 12:45–13:00, H 3005

Low-temperature spin-liquid phase in a S = 3/2 undistorted triangular lattice: RbAg₂Cr[VO₄]₂ — •Angela Möller¹, Joshua Tapp¹, Clarina R. dela Cruz², Michaela Bratsch³, Ngozi E. Amuneke³, Lars Postulka⁴, Bernd Wolf⁴, Michael Lang⁴, Harald O. Jeschke⁵, Roser Valentí⁴, and Peter Lemmens⁶ — ¹JGU Mainz, D — ²ORNL, USA — ³University of Houston, USA — ⁴GU Frankfurt, D — ⁵Okayama University, Jpn — ⁶TU Braunschweig, D

We present a series of distorted and undistorted antiferromagnetic triangular lattice (TL) compounds, AAg₂Cr[VO₄]₂ with A = Ag, K, or Rb. The A-site cation induces slight symmetry changes of the [CrO₆] complex and thereby alters the relative orientation of the vanadate with respect to the TL. This aspect of fine-tuning allows for distinct alterations of the magnetic exchange interactions between the Cr³⁺ (3d³) ions, J^Ag=3K, J^K=1K, J^Rb=0.5K. We observe for the distorted TL collinear antiferromagnetic long-range order at T_N=10K (A = Ag), whereas the high-symmetry cases (A = K, Rb) even evade the theoretically predicted 120^∘ long-range order in zero field down to 0.03K.[1] Our experiments support a spin liquid ground state for the latter compounds which is unconventional for antiferromagnetic TL systems and points towards the relevance of additional competing interaction mechanisms.

This work received support from NSF, ORNL-DOE, Carl-Zeiss Stiftung, and DFG.
J. Tapp et al. Phys. Rev. B 96, 064404 (2017).