Berlin 2018 – wissenschaftliches Programm
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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, JAg=3K, JK=1K, JRb=0.5K. We observe for the distorted TL collinear antiferromagnetic long-range order at TN=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).