Volume 112, Number 4, November 2015
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 December 2015|
Magnetic quantum phase transitions of the two-dimensional antiferromagnetic J1-J2 Heisenberg model
Instituto de Física, Universidade Federal do Rio de Janeiro - Caixa Postal 68528, Brasil
Received: 23 July 2015
Accepted: 13 November 2015
We obtain the complete magnetic phase diagram of the two-dimensional antiferromagnetic Heisenberg model, , within the framework of the O(N) nonlinear sigma model. We find two magnetically ordered phases, one with Néel order, for , and another with collinear order, for , separated by a nonmagnetic region, for , where a gapped spin liquid is found. The transition at is of the second order while the one at is of the first order and the spin gaps cross at . Our results are exact at N → ∞ and agree with numerical results from different methods.
PACS: 78.30.-j – Infrared and Raman spectra / 63.20.Ry – Anharmonic lattice modes
© EPLA, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.