Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Magnetism – Spin Liquids I
TT 72.4: Talk
Thursday, March 12, 2026, 10:15–10:30, HSZ/0105
Emergent magnetic order and spin dynamics in a Yb-based triangular lattice delafossite — •Arjun Unnikrishnan1,2,3, Bishnu Prasad Belbase1, Piyush Chhallare1, Mohan Bikram Neupane1, Eun Sang Choi4, Philipp Gegenwart2, and Arnab Banerjee1 — 1Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47906, USA — 2Experimental Physics VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, Augsburg 86159, Germany — 3Solid State and Structural Chemistry Unit (SSCU), Indian Institute of Science, Bengaluru - 560012, India — 4National High Magnetic Field Laboratory, Tallahassee, Florida - 32310, USA
We have synthesized a new member of the AYbX2 (A = monovalent cation; X = O, S, Se, Te) delafossite family and investigated its magnetic properties using magnetization and heat-capacity measurements. At zero magnetic field, the system shows no evidence of long-range magnetic order down to 20 mK. When a magnetic field is applied along the ab-plane, multiple field-induced magnetic phases emerge above ∼ 2.5 T, followed by full spin polarization near 17 T. The material exhibits stronger exchange interactions compared to other known Yb-based delafossites. We will discuss the magnetic phase transitions and the evolution of the spin dynamics under applied fields. The heat-capacity results suggest the presence of a possible quantum spin liquid (QSL) phase at low temperatures and low magnetic fields, highlighting this system as a promising platform for exploring QSL physics.
Keywords: Quantum Spin Liquid; Frustarted Traingular lattice; Low-Temperature Magnetism; Field-Induced Magnetic Phases; Yb - Based Delafossite