63,65Cu NQR Spectra and Spin–Lattice Relaxation in Thermoelectric CuAlO2

The 63,65 Cu nuclear quadrupole resonance spectra and spin–lattice relaxation rate (1/ T 1 ) have been measured in the semiconductor compound CuAlO 2 . The value of the nuclei quadrupole interaction constant Q CC = 56.24(6) MHz ( T = 298 K) has been obtained. The broad maximum has been found in th...

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Veröffentlicht in:	Applied magnetic resonance 2019-04, Vol.50 (4), p.619-625
Hauptverfasser:	Ogloblichev, V. V., Matukhin, V. L., Arapova, I. Yu, Schmidt, C. V., Khusnutdinov, R. R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymmetry Atoms and Molecules in Strong Fields Copper Electric fields Energy levels Forbidden bands Isotopes Laser Matter Interaction Low temperature Measurement techniques Nuclear quadrupole resonance Organic Chemistry Original Paper Phase transitions Physical Chemistry Physics Physics and Astronomy Quadrupole interaction Quadrupoles Solid State Physics Spectra Spectroscopy/Spectrometry Spin-lattice relaxation Temperature dependence
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Zusammenfassung:	The 63,65 Cu nuclear quadrupole resonance spectra and spin–lattice relaxation rate (1/ T 1 ) have been measured in the semiconductor compound CuAlO 2 . The value of the nuclei quadrupole interaction constant Q CC = 56.24(6) MHz ( T = 298 K) has been obtained. The broad maximum has been found in the temperature dependence of 1/ T 1 in the low-temperature region (below 276 K). This maximum can be associated with the presence of energy levels in the forbidden band. The activation energy has been estimated in CuAlO 2 [ E A = 45(2) meV], assuming the activation character of the mobility of holes.
ISSN:	0937-9347 1613-7507
DOI:	10.1007/s00723-018-1096-9