Non-trivial phases and thermal state selection in the highly frustrated honeycomb lattice under a magnetic field

H. D. ROSALES; F A GÓMEZ ALBARRACÍN; D. C. CABRA

Buenos Aires

Simposio; Frontiers in physical sciences - 2016; 2016

International Center for Advanced Studies

In magnetic systems, frustration between different interactions gives rise to different exotic phenomena like quantum and thermal order by disorder,spin liquids, extensive entropy.Highly frustrated systems are ideal to explore this phases. In this work,some of these phases are found in the classical honeycomb lattice at thisparticular point considering up to third nearest neighbour bonds. Thismodel has recently been considered relevant in connection withhoneycomb-layered iridates, where further neighbour interactions might benecessary to explain the experimental measurements.In the model presented here, the phenomenology at low temperatures dependson the dimension of the spins: Heisenberg spins show a disordered spinliquid-like phase. On the other hand, there is evidence of order bydisorder for XY spins in all the magnetisation curve, showing inparticular two collinear pseudo plateaus and broken symmetries at lowtemperature. We discuss the different low temperature phases andcharacterise them with relevant complex order parameters.