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

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

Buenos Aires

Congreso; Frontiers in Physical Sciences; 2016

International Center for Advanced Studies (ICAS) - UNSAM

(poster) 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 this particular point considering up to third nearest neighbour bonds. This model has recently been considered relevant in connection with honeycomb-layered iridates, where further neighbour interactions might benecessary to explain the experimental measurements. In the model presented here, the phenomenology at low temperatures depends on 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 and characterise them with relevant complex order parameters.