Anisotropy of dipolar-broadened nuclear spin resonance

20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics

Tsyplyatyev, Oleksandr^1 ; Avotina, Yevgeniya^1

Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom^1

关键词: Angular dependence;    Angular dependencies;    Combinatorial method;    External magnetic field;    Fourth cumulants;    Line shifts;    Nuclear spins;    Nuclear state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/456/1/012037/pdf
DOI  :  10.1088/1742-6596/456/1/012037

来源: IOP

【 摘 要 】

We study anisotropy of the homogeneously broadened nuclear spin resonance in a crystal. Using a combinatorial method to restrict the nuclear states to a fixed polarisation, we obtain the first four cumulants of the full line-shape as a function of polarisation of the nuclei and angles between the external magnetic field and the crystalline axes. We demonstrate that the line width is relatively isotropic but the other cumulants such as line shift and higher then the second cumulants are strongly anisotropic. Also the angular dependencies of the first three cumulants are found to be independent of the polarisation but the fourth cumulant changes its angular dependence with a change of the nuclear polarisation. This result shows that the orientation of the external magnetic field is an essential parameter in a study of polarised nuclei.