Effect of magnetostriction on the NMR spectra of Van Vleck paramagnets
Al'tshuler S. A. , Kudryashov A. A., Teplov M. A. , Terpilovskii D. N.
An anisotropy of the Van Vleck paramagnetic susceptibility in the (001) plane of the tetragonal crystal LiTmF4 has been detected by an NMR method. The susceptibility oscillation depth varies in proportion to Η2 and has the value 1.3 XlO"2 in a field Η = 6.7 Юе. Perturbation-theory calculations show that the anisotropy of χ results from a magnetostriction of the crystal and a mixing of the Tm3+ wave functions in a magnetic field.
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![](/ps/1316/article_19894_800_head.png "An anisotropy of the Van Vleck paramagnetic susceptibility in the (001) plane of the tetragonal crystal LiTmF<sub>4</sub> has been detected by an NMR method. The susceptibility oscillation depth varies in proportion <b><i>to Η<sup>2</sup> </i></b>and has the value 1.3 XlO"<sup>2</sup> in a field <b><i>Η = </i></b>6.7 Юе. Perturbation-theory calculations show that the anisotropy of <b><i>χ </i></b>results from a magnetostriction of the crystal and a mixing of the Tm<sup>3+</sup> wave functions in a magnetic field.")