Nuclear spin-lattice relaxation studies of Cu${}_2$O

Abstract

We report the ${}^{63}$Cu and ${}^{65}$Cu nuclear spin-lattice relaxation rate measurements of cuprous oxide Cu${}_2$O in a zero field Cu nuclear quadrupole resonance at $T$ = 77$-$325 K. From the detailed isotopic measurements of the relaxation rates, we successfully estimated a finite magnetic relaxation rate ${}^{63}{W}_M$ and a predominant nuclear quadrupole relaxation rate ${}^{63}{W}_Q$. ${}^{63}{W}_Q$ changed as $T^{2.1}$, while ${}^{63}{W}_M$ changed as $T^{1.6}$ or $T^{\beta }\exp (-\Delta /T)$ with $\beta$ = 0.6(3) and $\Delta$ = 190(62) K. The nuclear spin scattering process due to a non-degenerate Fermi gas was discussed as a possible candidate of the magnetic relaxation.

5 pages, 4 figures: revised & corrected typo mistake

References in corpus (1)

• Bose-Einstein Condensation of Excitons in Cu${}_2$O: Progress Over Thirty Years