A fictitious-spin calculation of the nuclear magnetic relaxation of nuclei of spin I= 3/2 in the presence of strong quadrupole coupling

Abstract

The problem of the nuclear relaxation of nuclei of spin I = 3/2 in the presence of strong quadrupole coupling is treated by means of the fictitious-spin (FS) formalism. Considering the magnetic hyperfine field as the only source of spin - lattice relaxation, we employed the FS method to obtain both the multiexponential decay law of the spin - lattice relaxation and the so-called -contribution to the transverse relaxation . As an example we discuss the determination of the spin - spin relaxation rate of the planar copper in the high-temperature superconductor.

Ultraslow fluctuations in the pseudogap states ofHgBa2CaCu2O6+δ

“…1/T 2L should agree with the Redfield relaxation rate 1/T 2R in Refs. [7,27,29] from the anisotropic T 1 's. We estimate 1/T 2R from…”

“…according to uniaxially symmetric fluctuations (J aa = J bb is then denoted by J ab ) [7,27,[29][30][31][32]. (1/T 2R ) ab is the relaxation rate for B⊥c axis.…”

Three-pulse spin echo signals from quadrupolar nuclei in magnetic materials

“…The two-pulse and three-pulse spin-echo signals from quadrupolar nuclei are widely used in NMR echo spectroscopy of the diamagnetic substances [1][2][3][4][5][6]. In the case of magnetically ordered substances the two-pulse spin-echo signals from quadrupolar nuclei are used at the present time only [7][8][9][10][11].…”