Low-Frequency Dynamics of Charge Carriers in CuAlO2 Semiconductor According to NMR Data.

Autor:	Ogloblichev, V. V., Smolnikov, A. G., Buzlukov, A. L., Piskunov, Yu. V., Arapova, I. Yu., Sadykov, A. F., Matukhin, V. L.
Předmět:	CHARGE carriers CURIE-Weiss law SPIN-lattice relaxation MAGNETIC moments CRYSTAL lattices
Zdroj:	Journal of Experimental & Theoretical Physics; Nov2021, Vol. 133 Issue 5, p567-573, 7p
Abstrakt:	The 63Cu and 27Al NMR spectra have been obtained on a polycrystalline CuAlO2 sample in external magnetic field H0 = 92.8 kOe in temperature range 30–400 K. Analysis of the 27Al NMR spectra has revealed that with temperature decrease, the NMR line shift 27K increases in magnitude and can be described by the Curie–Weiss law. Such a behavior can be attributed to the emergence of an effective magnetic moment at copper ions due to the motion of holes in the copper sublattice. In the low-temperature range, the maximum of the spin–lattice relaxation rate of 27Al nuclei is observed, which is most probably induced by thermally activated diffusion of holes. Analysis of experimental data on yields an estimate Ea ≈ 0.1–0.2 eV for the activation energy. The temperature dependences of the quadrupole interaction parameters indicate the crystal lattice compression along the a and c axes. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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