Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 50: Poster Session: Correlated Electrons 2
TT 50.18: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Exploring the magnetism of the new frustrated S = 1 isolated spin-triangle system BHAP-Ni3 — •S. Chattopadhyay1, B. Lenz2, S. Kanungo3, S. K. Panda2, S. Biermann2,5, W. Schnelle6, K. Manna6, M. Uhlarz1, Y. Skourski1, T. Herrmannsdorfer1, R. Patra4, and J. Wosnitza1,7 — 1Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, Germany — 2Centre de Physique Théorique, Ecole Polytechnique, France — 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
We report a combined experimental and theoretical study on the new frustrated quantum-magnet BHAP-Ni3 synthesized in single-crystalline form. BHAP-Ni3 provides an ideal opportunity to study the magnetism of a frustrated spin-triangle unit as it is comprised of spin-1 triangles where each triangle is essentially magnetically isolated. Our pulsed-field magnetometry reveals the presence of an exotic state that stabilizes a pronounced 2/3 magnetization plateau between 7 and 20 T. AC-susceptibility measurements performed down to 60 mK show the absence of magnetic order or a glassy state in this material. The magnetic ground state is found to be disordered and specific-heat measurements show a gapped nature of spin excitations. Our theoretical modeling suggests that the 2/3 plateau originates from the interplay between Heisenberg and biquadratic spin-spin interactions.