Order and disorder, crossovers, and phase transitions in dipolar artificial spin ice on the Cairo lattice

Shevchenko, Yu. A.; Strongin, Vladislav; Kapitan, Vitalii; Soldatov, Konstantin; Makarov, Aleksandr; Padalko, Mihail; Nefedev, Konstantin

doi:10.1103/physreve.106.064105

Cited by 4 publications

(1 citation statement)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ASIs are lattice of ferromagnetic elements that interact via in-plane dipoles and are arranged to produce geometric frustration effects [13][14][15][16][17][18][19][20]. In the Cairo geometry, recent experimental works have found a rich behavior due to frustration [21,22], while Monte Carlo simulations reported the presence of long-range order [23]. Even mechanical analogues of Cairo artificial spin ice were realized via 3D-printing [24].…”

Section: Introductionmentioning

confidence: 99%

Ice rule breakdown and frustrated antiferrotoroidicity in an artificial colloidal Cairo ice

Rodríguez-Gallo,

Ortiz-Ambriz,

Nisoli

et al. 2023

New J. Phys.

View full text Add to dashboard Cite

We combine experiments and numerical simulations to investigate the lowenergy states and the emergence of topological defects in an artificial colloidal ice inthe Cairo geometry. This type of geometry is characterized by a mixed coordination(z), with coexistence of both z = 3 and z = 4 vertices. We realize this particle ice byconfining field tunable paramagnetic colloidal particles within a lattice of topographicdouble wells at a one to one filling using optical tweezers. By raising the interactionstrength via an applied magnetic field, we find that the ice rule breaks down, andpositive monopoles with charge q = +2 accumulate in the z = 4 vertices and arescreened by negative ones (q = −1) in the z = 3. The resulting, strongly coupledstate remains disordered. Further, via analysis of the mean chirality associated toeach pentagonal plaquette, we find that the disordered ensemble for this geometry ismassively degenerate and it corresponds to a frustrated antiferrotoroid.

show abstract