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Geometric frustration of colloidal dimers on a honeycomb magnetic lattice

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We study the phase behavior and the collective dynamics of interacting paramagnetic colloids assembled above a honeycomb lattice of triangular shaped magnetic minima. A frustrated colloidal molecular crystal is realized when filling these potential minima with exactly two particles per pinning site. External in-plane rotating fields are used to anneal the system into different phases, including long range ordered stripes, random fully packed loops, labyrinth and disordered states. At a higher amplitude of the annealing field, the dimer lattice displays a two-step melting transition where the initially immobile dimers perform first localized rotations and later break up by exchanging particles across consecutive lattice minima.

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TIERNO, Pietro. Geometric frustration of colloidal dimers on a honeycomb magnetic lattice. _Physical Review Letters_. 2016. Vol. 116, núm. 038303-1-038303-5. [consulta: 21 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/96048]

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