Abstract:
Influence of weak (below 50 Oe) constant magnetic field on quadrupole spin-echo envelope was studied for non-doped single crystal Bi4Ge3O12Bi4Ge3O12, in which local magnetic fields of the order of 20–30 G were earlier found, as well as for single crystals Bi4Ge3O12Bi4Ge3O12 doped with atoms of transition and rare earth elements. In all the cases, the spin-echo envelopes were strongly influenced. A considerable increase in the nuclear spin-spin relaxation time T2T2 was observed for the non-doped sample upon switching weak external magnetic fields. For the doped samples, the spin-echo envelope decay became much slower already in zero field. The external magnetic fields exhibited markedly weaker influence on the spin-echo envelope for the doped samples.
Citation:
E. A. Kravchenko, V. G. Orlov, Yu. F. Kargin, “Quadrupole spin-echo envelopes for Bi4Ge3O12Bi4Ge3O12 single crystals doped with atoms of transition and rare earth elements”, Pis'ma v Zh. Èksper. Teoret. Fiz., 86:5 (2007), 390–392; JETP Letters, 86:5 (2007), 337–339