Artículos de revistas
Broken discrete symmetries in a frustrated honeycomb antiferromagnet
Fecha
2013-03Registro en:
Rosales, Héctor Diego; Cabra, Daniel Carlos; Lamas, Carlos Alberto; Pujol, P.; Zhitomirsky, M. E.; Broken discrete symmetries in a frustrated honeycomb antiferromagnet; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 87; 10; 3-2013; 104402-104407
1098-0121
CONICET Digital
CONICET
Autor
Rosales, Héctor Diego
Cabra, Daniel Carlos
Lamas, Carlos Alberto
Pujol, P.
Zhitomirsky, M. E.
Resumen
We study the magnetic phase diagram of the J1-J2 Heisenberg antiferromagnet on a honeycomb lattice at the strongly frustrated point J2/J1=1/2 using large-scale Monte Carlo simulations. At low temperatures we find three different field regimes, each characterized by different broken discrete symmetries. In low magnetic fields up to hc1/J1≈2.9 the Z3 rotational lattice symmetry is spontaneously broken while a 1/2-magnetization plateau is stabilized around hc2/J1=4. The collinear plateau state and the coplanar state in higher fields break the Z 4 translational symmetry and correspond to triple-q magnetic structures. The intermediate phase hc1<h<hc2 has an interesting symmetry structure, breaking simultaneously the Z3 and Z4 symmetries. At much lower temperatures the spatial broken discrete symmetries coexist with the quasi-long-range order of the transverse spin components.