Antiferromagnetic Nuclear Resonance in the Quasi-Two-Dimensional (CuBr)LaNb2O7
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN(2008)
Abstract
We report nuclear magnetic resonance (NMR) studies in the antiferromagnetic state of the quasi-two-dimensional (CuBr)LaNb2O7. The NMR spectra at zero magnetic field and 4.2 K indicate a unique Cu and Br sites with an internal field of 5.7 T (at Cu) and 16.4 T (at Br), confirming a magnetic order. For the large internal field at the Br sites to be compatible with the collinear antiferromagnetic order observed by neutron diffraction experiments, the Br atoms must move significantly off the center of the square of the Cu sublattice so that the Br nuclei couple predominantly to two parallel Cu moments. While invalidating the frustrated J(1)-J(2) model defined on a C-4-symmetric square lattice. our results are compatible with the structural model proposed for (CuCl)LaNb2O7 by Yoshida et al.
MoreTranslated text
Key words
NMR,(CuBr)LaNb2O7,quantum spin system,collinear order,structural distortion
AI Read Science
Must-Reading Tree
Example
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
Generate MRT to find the research sequence of this paper
Chat Paper
Summary is being generated by the instructions you defined