NMR spectra and nuclear relaxation in Pr1.85Ce0.15CuO4-y at low temperatures
Bakharev O. N. , Volodin A. G., Egorov A. V. , Tagirov M. S. , Teplov M. A.
The spin-echo method at frequencies of 16 and 23 MHz has been used to study the NMR spectra and the nuclear relaxation of 141Pr and 65Cu in a partially oriented powder of the "electron superconductor" Pr 185 Ce0,5 Cu04 _ y at temperatures from 4.2 К down to 0.05 K. Two types of 141Pr + 3 centers (rapidly relaxing and slowly relaxing) were observed, in a concentration ratio 2:1, with approximately the same magnetic properties. The pronounced slowing of the nuclear relaxation observed at temperatures on the order of 0.5 К is attributed to the possible onset of superconductivity in a system of square Pr and Ce lattices.
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![](/ps/1158/article_17524_800_head.png "The spin-echo method at frequencies of 16 and 23 MHz has been used to study the NMR spectra and the nuclear relaxation of <sup>141</sup>Pr and <sup>65</sup>Cu in a partially oriented powder of the "electron superconductor" Pr <sub>185</sub> Ce<sub>0</sub>,<sub>5</sub> Cu0<sub>4</sub> _ <sub>y</sub> at temperatures from 4.2 К down to 0.05 K. Two types of <sup>141</sup>Pr <sup>+</sup> <sup>3</sup> centers (rapidly relaxing and slowly relaxing) were observed, in a concentration ratio 2:1, with approximately the same magnetic properties. The pronounced slowing of the nuclear relaxation observed at temperatures on the order of 0.5 К is attributed to the possible onset of superconductivity in a system of square Pr and Ce lattices.")