Synthesis, structural and magnetic properties of the solid solution (CuCl1-xBrx)LaNb2O7 (0 < x < 1)

Yoshihiro Tsujimoto, Atsushi Kitada, Hiroshi Kageyama, Masakazu Nishi, Yasuo Narumi, Koichi Kindo, Yoko Kiuchi, Yutaka Ueda, Yasutomo J. Uemura, Yoshitami Ajiro, Kazuyoshi Yoshimura

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The two-dimensional (2D) quantum spin system (CuCl)LaNb2O 7 has a spin-singlet ground state with a gap of 2.3 meV, while the isostructural material (CuBr)LaNb2O7 displays a collinear antiferromagnetic order at TN = 32 K. Here, we report on the synthesis of solid solution (CuCl1-xBrx)LaNb 2O7 (0 < x < 1), and its structural and magnetic properties investigated by magnetic susceptibility, high-field magnetization, and neutron diffraction measurements. The x dependences of cell parameters follow Vegard's law, verifying the uniform distribution of Cl and Br atoms at the halide site, although a more complex structural evolution is inferred from an opposing correlation between the intra- and interlayer cell distances (vs x). 5%-Br substitution is found to induce an antiferromagnetic order with T N = 7 K, consistent with recent μSR results, and the magnetic structure is collinear, having a significantly reduced moment. Further Br substitution leads to a linear increase in TN up to x = 1. These results indicate that (CuCl)LaNb2O7 is located in the vicinity of the quantum phase boundary.

Original languageEnglish
Article number014709
Journaljournal of the physical society of japan
Volume79
Issue number1
DOIs
Publication statusPublished - 2010 Jan

Keywords

  • (CuBr)LaNbO
  • (CuCl)LaNbO
  • Magnetization
  • Neutron diffraction
  • Quantum spin system
  • Spin gap
  • Susceptibility

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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