Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-10-15
Phys. Rev. B 83, 064416 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
9 pages, 7 figures
Scientific paper
10.1103/PhysRevB.83.064416
We present results of a complementary analysis of the frustrated planar J_1-J_2-J_3 spin-1/2 quantum-antiferromagnet. Using dynamical functional renormalization group, high-order coupled cluster calculations, and series expansion based on the flow equation method, we have calculated generalized momentum resolved susceptibilities, the ground state energy, the magnetic order parameter, and the elementary excitation gap. From these we determine a quantum phase diagram which shows a large window of a quantum paramagnetic phase situated between the Neel, spiral and collinear states, which are present already in the classical J_1-J_2-J_3 antiferromagnet. Our findings are consistent with substantial plaquette correlations in the quantum paramagnetic phase. The extent of the quantum paramagnetic region is found to be in satisfying agreement between the three different approaches we have employed.
Arlego Marcelo
Brenig Wolfram
Darradi Rachid
Reuther Johannes
Richter Johannes
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