期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 77, 期 10, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.104705
关键词
NMR; (CuBr)LaNb2O7; quantum spin system; collinear order; structural distortion
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan. [18740202, 17684018, 16076204, 16076210, 19052004]
- Grants-in-Aid for Scientific Research [16076204, 18740202, 17684018] Funding Source: KAKEN
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.
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