Nuclear Quadrupole Interactions of 7Li and 51V in a Li3VO4 Single Crystal Studied by Nuclear Magnetic Resonance.

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  • Nuclear Quadrupole Interactions of<sup>7</sup>Li and<sup>51</sup>V in a Li<sub>3</sub>VO<sub>4</sub>Single Crystal Studied by Nuclear Magnetic Resonance

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The rotation patterns of the nuclear magnetic resonances of 7Li (I=3⁄2) and 51V (I=7⁄2) in the nonlinear optical Li3VO4 single crystal were measured in two mutually perpendicular crystal planes. From these results, the quadrupole coupling constants and the asymmetry parameters at room temperature were determined for the first time as follows: e2qQh=53.68±2 kHz and η=0.169 for 7Li, and e2qQh=1.44±2 MHz and η=0 for 51V. The symmetry for the electric field gradient (EFG) of V ions surrounded by four oxygen atoms is higher than that of Li ions surrounded by four oxygen atoms. The principal axes of the EFG tensor are a=Y, b=Z, c=X for 7Li, and a=b=X, c=Z for 51V nucleus. Also, the 7Li and the 51V spin–lattice relaxation rates were measured, and the behavior is quite similar for both nuclei. The measured relaxation rate was found to be linear in the square of the temperature. The Raman process with a T2 dependence is considered to be more effective than the direct process for nuclear quadrupole relaxation.

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