Structural Transitions and Magnetic Structure in NH_4CuCl_3 via ^<14>N-NMR(Magnetization Plateaus, Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)
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概要
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We report results of ^<14>N-NMR experiments on NH_4CuCl_3 at the magnetic field of 7T, where the 1/4-magnetization plateau is observed at low temperatures. The quadrupole coupling parameter v_z splits below 70K, indicating a structural phase transition. At 4.2K, eight N sites with distinct values of both v_z and the magnetic hyperfine shift K_z are resolved in the NMR spectrum for general field directions. We then conclude that the magnetic structure in the 1/4-plateau does not break the symmetry of the crystal. Based on the NMR and the recent neutron scattering results by Ruegg et al. [Phys. Rev. Lett. 93 (2004), 037207], we propose that triplet dimers in the 1/4-plateau are formed not between the nearest neighbor pairs but over different chains.
- 理論物理学刊行会の論文
- 2005-10-31
著者
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TAKIGAWA Masashi
Institute for Solid State Physics, University of Tokyo
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TANAKA Hidekazu
Research Center for Low Temperature Physics, Tokyo Institute of Technology
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Takigawa Masashi
Institute For Solid State Physics The University Of Tokyo
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Kodama Katsuaki
Institute For Solid State Physics The University Of Tokyo
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Takigawa Masashi
Institute For Solid State Physics Iniversity Of Tokyo
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Tanaka Hidekazu
Research Center For Low Temperature Physics Tokyo Institute Of Technology
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TAKIGAWA Masashi
Institute for Solid State Physics, The University of Tokyo
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KODAMA Katsuaki
Institute for Solid State Physics, The University of Tokyo
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