Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Correlated Magnetism – Frustrated Systems
TT 26.11: Vortrag
Mittwoch, 19. März 2025, 12:15–12:30, H33
Anisotropic Spin Ice on a Breathing Pyrochlore Lattice — •Gloria Isbrandt1,2, Frank Pollmann1,2, and Michael Knap1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Munich Center for Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 München, Germany
Spin ice systems have long captivated researchers due to their exotic magnetic properties and emergent excitations. Recently, breathing pyrochlore compounds have been identified as a platform for studying novel phases, including fracton physics and quantum spin liquids. We explore a spin ice model on a breathing pyrochlore lattice, introducing sublattice-dependent anisotropic interactions that are potentially realizable experimentally, for example, through uniaxial strain. We theoretically uncover a rich phase diagram by varying the strain and show how these anisotropic constraints reduce the ground state degeneracy across the different phases. Our numerical simulations reveal that, at low temperatures, the models undergo a crossover into a constrained spin ice manifold, characterized by an entropy density that falls below the celebrated Pauling entropy of conventional spin ice. Moreover, we observe glassy dynamics in spin correlations when probing the out-of-equilibrium behavior, suggesting slow relaxation and memory effects. This model provides a new perspective on spin ice physics, offering a potentially robust platform for studying fracton phenomena and experimental exploration of constrained magnetism and emergent glassy dynamics.
Keywords: Spin Ice; Fractons; Glassy dynamics