Nuclear Magnetic Resonance Study of the Crytoallographically Inequivalent Cs (I) and Cs (II) in a Cs_2CoCl_4 Single Crystal
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概要
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^<133>Cs (I = 7/2) nuclear magnetic resonance in a Cs_2CoCl_4 single crystal grown by using the slow evaporation method was measured in the two mutually perpendicular crystal planes. The ^<133>Cs resonances of two different groups, respectively, with two crystallographically inequivalent cesium nuclei, Cs (I) and Cs (II) in the unit cell, were recorded. From their angular dependences, the Cs (T) and the Cs (II) nuclei have different values for the quadrupole coupling constant and the asymmetry parameter. The quadrupole coupling constant and the asymmetry parameter obtained for Cs (I) with a smaller separation were e^2qQ/h = 725KHz and η = 0.58. Those for Cs(II) with a larger separation were e^2qQ/h = 802kHz and η = 0.85 = 0.85. The electric field gradient (EFG) tensors of Cs (I) and Cs (II) are asymmetric, and the orientations of their principal axes do not coincide. The Cs(I) ion surrounded by 11 chlorine ions has a small quadrupole parameter and is high in symmetry. The Cs (II) ion surrounded by 9 chlorine ions has a larger quadrupole parameter and is lower in symmetry than the Cs (I) ion. In addition, the spin-lattice relaxation time for ^<133>Cs was decreased with increasing temperature in the temperature range from 180 to 400K. The relaxation behavior of Cs (I) and Cs (II) can be explained by the direct process of scattering from a single phonon.
- 社団法人日本物理学会の論文
- 2003-03-15
著者
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Shin Hee
Department Of Applied Biological Chemistry Graduate School Of Agricultural And Life Sciences The Uni
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Lim Ae
Department Of Physics Jeonju University
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Shin Hee
Department Of Physics Jeonju Uneversity
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LIM Ac
Department of Physics Jeonju Uneversity
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