Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-02-23
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 4 figures, to be published in PRB
Scientific paper
10.1103/PhysRevB.73.094427
The two dimensional Heisenberg antiferromagnet on the square lattice with nearest (J1) and next-nearest (J2) neighbor couplings is investigated in the strong frustration regime (J2/J1>1/2). A new effective field theory describing the long wavelength physics of the model is derived from the quantum hamiltonian. The structure of the resulting non linear sigma model allows to recover the known spin wave results in the collinear regime, supports the presence of an Ising phase transition at finite temperature and suggests the possible occurrence of a non-magnetic ground state breaking rotational symmetry. By means of Lanczos diagonalizations we investigate the spin system at T=0, focusing our attention on the region where the collinear order parameter is strongly suppressed by quantum fluctuations and a transition to a non-magnetic state occurs. Correlation functions display a remarkable size independence and allow to identify the transition between the magnetic and non-magnetic region of the phase diagram. The numerical results support the presence of a non-magnetic phase with orientational ordering.
Lante Valeria
Parola Alberto
No associations
LandOfFree
The Ising phase in the J1-J2 Heisenberg Model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Ising phase in the J1-J2 Heisenberg Model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Ising phase in the J1-J2 Heisenberg Model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-711433