Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Frustrated Magnets - General 1 (joint session TT/MA)
TT 23.9: Vortrag
Dienstag, 2. April 2019, 11:45–12:00, Theater
Importance of biquadratic exchange for a new Ni-based quantum magnet of frustrated S=1 isolated spin-triangles — •B Lenz1, S Chattopadhyay2, S Kanungo3, NA Sushila4, S K Panda1, S Biermann1,5, W Schnelle6, K Manna2, R Kataria4, M Uhlarz2, Y Skourski2, S A Zvyagin2, A Ponomaryov2, T Herrmannsdörfer2, R Patra4, and J Wosnitza2,7 — 1CPHT, Ecole Polytechnique, Palaiseau, France — 2Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, Germany — 3School of Physical Sciences, IIT Goa, India — 4Department of Chemistry and Centre for Advanced Studies in Chemistry, Panjab University, India — 5Collège de France, Paris, France — 6Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 7Institut für Festkörper- und Materialphysik, TU Dresden, Germany
The new metal-organic framework BHAP-Ni3 is comprised of essentially isolated spin-1 triangle centers, which renders this quantum magnet an ideal system to study the magnetism of a frustrated spin-triangle unit. Pulsed-field magnetometry and AC-susceptibility measurements of single-crystalline samples allow to identify a disordered magnetic ground state and a peculiar pronounced 2/3 magnetization plateau between 7T and 20T. Here, we show how theoretical modeling guided by ab initio calculations identifies the interplay of Heisenberg and biquadratic spin-spin interactions to be responsible for the stabilization of an exotic state that manifests itself in form of the 2/3 magnetization plateau.