Phase diagram of the bccS=12Heisenberg antiferromagnet with first and second neighbor exchange

@inproceedings{Oitmaa2004PhaseDO,
  title={Phase diagram of the bccS=12Heisenberg antiferromagnet with first and second neighbor exchange},
  author={Jaan Oitmaa and Weihong Zheng},
  year={2004}
}
We use linked-cluster series expansions, both at T=0 and high temperature, to analyze the phase structure of the spin- Heisenberg antiferromagnet with competing first- and second-neighbor interactions on the three-dimensional body-centered-cubic lattice. At zero temperature we find a first-order quantum phase transition at J 2 /J 1 ≃0.705′0.005 between AF 1 (Neel) and AF 2 ordered phases. The high-temperature series yield quite accurate estimates of the bounding critical line for the AF 1 phase… CONTINUE READING