Spin-1/2 J1-J2 model on the body-centered cubic lattice

Details Spin-1/2 J1-J2 model on the body-centered cubic lattice Spin-1/2 J1-J2 model on the body-centered cubic lattice

2002-03-05

arxiv.org/abs/cond-mat/0203085v2

Phys. Rev. B 66, 224406 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

6.1 pages 7 figures

Scientific paper

10.1103/PhysRevB.66.224406

Using exact diagonalization (ED) and linear spin wave theory (LSWT) we study the influence of frustration and quantum fluctuations on the magnetic ordering in the ground state of the spin-1/2 J1-J2 Heisenberg antiferromagnet (J1-J2 model) on the body-centered cubic (bcc) lattice. Contrary to the J1-J2 model on the square lattice, we find for the bcc lattice that frustration and quantum fluctuations do not lead to a quantum disordered phase for strong frustration. The results of both approaches (ED, LSWT) suggest a first order transition at J2/J1 $\approx$ 0.7 from the two-sublattice Neel phase at low J2 to a collinear phase at large J2.

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