Antiferromagnetic Nuclear Resonance in the Quasi-Two-Dimensional (CuBr)LaNb2O7

被引：12

作者：

Yoshida, Makoto ^{[1
]}

Ogata, Nobuyuki ^{[1
]}

Takigawa, Masashi ^{[1
]}

Kitano, Taro ^{[2
]}

Kageyama, Hiroshi ^{[2
]}

Ajiro, Yoshitami ^{[2
]}

Yoshimura, Kazuyoshi ^{[2
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

[2] Kyoto Univ, Dept Chem, Grad Sch Sci, Kyoto 6068502, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 10期

关键词：

NMR; (CuBr)LaNb2O7; quantum spin system; collinear order; structural distortion;

D O I：

10.1143/JPSJ.77.104705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：7

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