Spin-Singlet Ground State in Two-Dimensional S=1/2 Frustrated Square Lattice: (CuCl)LaNb_2O_7(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• We report on the magnetic properties of double-layered perovskite (CuCl)LaNb_2O_7 with a square lattice of S=1/2 Cu^<2+> ions, prepared by topotactic ion-exchange reactions. Magnetic susceptibility exhibits a thermal-activated behavior, and the analysis of the data suggests competing ferro- and antiferromagnetic exchanges for first- and second-nearest-neighbor bonds, respectively. Neutron scattering experiments provide explicit evidence for a spin-singlet ground state with an energy gap of 2.3meV. The well-defined low-lying triplet mode is almost independent of Q despite densely packed magnetic ions in the CuCl plane. In addition, on the basis of the isolated dimer model, we found that the intradimer distance is as long as 8.8Å, which corresponds to the fourth-nearest-neighbor bond. These results indicate a sizable geometrical frustration that should impose severe constraints on the propagation of the triplet excitation, as in the case of SrCu_2(BO_3)_2. This argument is further reinforced by the observation of a collective-triplets bound state at 5.0meV.

• 社団法人日本物理学会の論文
• 2005-06-15

著者

• Viciu L.

  Department Of Chemistry And The Advanced Materials Research Institute University Of New Orleans:(pre

• Wiley J.b.

  Department Of Chemistry And The Advanced Materials Research Institute University Of New Orleans

• YOSHIMURA K.

  Department of Chemistry, Graduate School of Science, Kyoto University

• KAGEYAMA H.

  Department of Chemistry, Graduate School of Science, Kyoto University

• KITANO T.

  Department of Chemistry, Graduate School of Science, Kyoto University

• OBA N.

  Department of Chemistry, Graduate School of Science, Kyoto University

• NISHI M.

  Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo

• NAGAI S.

  Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo

• HIROTA K.

  Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo

• YASUDA J.

  Department of Chemistry, Graduate School of Science, Kyoto University

• BABA Y.

  Department of Chemistry, Graduate School of Science, Kyoto University

• AJIRO Y.

  Department of Chemistry, Graduate School of Science, Kyoto University

• Ajiro Y.

  Department Of Chemistry Graduate School Of Science Kyoto University

• Yoshimura K.

  Department Of Chemistry Graduate School Of Science Kyoto University

• Kageyama H.

  Department Of Chemistry Graduate School Of Science Kyoto University

• WILEY J.B.

  Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans

• VICIU L.

  Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans:(Present address)Department of Chemistry and Princeton Materials Institute, Princeton University

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