Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 77, Issue 10, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.104705
Keywords
NMR; (CuBr)LaNb2O7; quantum spin system; collinear order; structural distortion
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Funding
- 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
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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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