141Pr NMR in the "electron superconductor" Pr1.85Ce0.15CuO4-y
Bakharev O.N., Egorov A.V. Zhdanov R.Sh., Tagirov M.S., Teplov M.A.
The NMR of14 'Pr has been observed and studied in a partially oriented powder of the Van VleckparamagnetPrj 85Ce015Cu04 y by a spin-echo method at liquid-helium temperature. The parameters of the nuclear spin Hamiltonian are found. The energy interval between the singlet ground state (Γ3) and the singlet excited state (Г4) of the Pr3 + ion in the crystal electric field is estimated: Е(Г4) — E( Г3) = 815 ± 90 cm "1. The rate of the spin-lattice relaxation of14 'Pr nuclei measured at a frequency of 23 MHz is about 600 s ~ 1 and does not depend on the temperature over the interval 1.5-4.2 K.
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![](/ps/1154/article_17683_800_head.png "The NMR of<sup>14</sup> 'Pr has been observed and studied in a partially oriented powder of the Van VleckparamagnetPrj <sub>85</sub>Ce<sub>015</sub>Cu0<sub>4</sub> <sub>y</sub> by a spin-echo method at liquid-helium temperature. The parameters of the nuclear spin Hamiltonian are found. The energy interval between the singlet ground state (Γ<sub>3</sub>) and the singlet excited state (Г<sub>4</sub>) of the Pr<sup>3</sup> <sup>+</sup> ion in the crystal electric field is estimated: <i>Е</i><i>(Г<sub>4</sub>) — </i><i>E( </i><i>Г<sub>3</sub>) </i>= 815 ± 90 cm "<sup>1</sup>. The rate of the spin-lattice relaxation of<sup>14</sup> 'Pr nuclei measured at a frequency of 23 MHz is about 600 s ~ <sup>1</sup> and does not depend on the temperature over the interval 1.5-4.2 K.")