Abstract
The ac magnetic susceptibility of a single crystal has been measured along the three principal crystallographic axes in the temperature range from 50 K down to 0.07 K. The data obtained indicate that the compound orders antiferromagnetically at with the sublattice moments parallel to [001], which is consistent with earlier neutron-diffraction results. The data are interpreted in terms of the Ising model on the simple tetragonal lattice in the quasi-two-dimensional regime: the intralayer exchange is relatively strong and antiferromagnetic, whereas the interlayer exchange is ferromagnetic and an order of magnitude weaker, This model also describes well the earlier specific-heat data. The factors deduced from the low-temperature susceptibility, are in reasonable agreement with electron paramagnetic resonance measurements on Nd-doped
- Received 3 February 1998
DOI:https://doi.org/10.1103/PhysRevB.58.798
©1998 American Physical Society