Multiple echos and multiquantum effects in the NMR of magnetically ordered substances
Abelyashev G. N., Berzhanskii V. N., Sergeev N. A., Fedotov Yu. V.
An additional spin-echo signal involving 53 Cr nuclei (J = 3/2) has been discovered in the magnetic semiconductor CdCr2Se4. This new echo reflects only the magnetic hyperfine interactions and is caused by multiquantum effects.