Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 42: Magnetic Materials III

MA 42.4: Vortrag

Donnerstag, 3. April 2014, 15:45–16:00, HSZ 04

Spin-liquid phase and order-by-disorder on the frustrated swedenborgite-lattice — •Stefan Buhrandt¹ and Lars Fritz² — ¹Institut für theoretische Physik, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany — ²Institute for Theoretical Physics, Utrecht University, Leuvenlaan 4, 3584 CE Utrecht, The Netherlands

The phenomenon of frustration refers to the inability to satisfy competing interactions simultaneously. Often, strong frustration leads to a large number of degenerate ground states with fluctuations suppressing the ordering tendencies. A challenging task is to characterize the spin-liquid phase resulting from the inability to order and the eventual breaking of ground state degeneracy. While this is usually accomplished by small perturbations, an intrinsic effect is entropic order-by-disorder. We present evidence that a classical nearest-neighbor Heisenberg model on the swedenborgite lattice hosts both an extended spin-liquid phase as well as a version of entropic order-by-disorder taking place at very low temperatures. We argue that this observation renders magnetic insulators on the swedenborgite lattice a prime candidate for displaying spin liquid and order-by-disorder physics.