Spin-gap study of the model on the triangular lattice
School of Physics and Astronomy, Schuster Building, The University of Manchester - Manchester, M13 9PL, UK
Received: 3 August 2015
Accepted: 21 December 2015
We use the coupled cluster method implemented at high orders of approximation to study the model on the triangular lattice with Heisenberg interactions between nearest-neighbour and next-nearest-neighbour pairs of spins, with coupling strengths J1 > 0 and , respectively. In the window we find that the 3-sublattice 120° Néel-ordered and 2-sublattice 180° stripe-ordered antiferromagnetic states form the stable ground-state phases in the regions and , respectively. The spin-triplet gap is found to vanish over essentially the entire region of the intermediate phase.
PACS: 75.10.Jm – Quantized spin models, including quantum spin frustration / 75.10.Kt – Quantum spin liquids, valence bond phases and related phenomena
© EPLA, 2015