785 Russian Physics Journal, Vol. 52, No. 8, 2009 INVESTIGATION OF THE Mn-DOPED COMPOUND CuGaTe 2 BY 63 Cu AND 69 Ga NUCLEAR MAGNETIC RESONANCE TECHNIQUES V. L. Matukhin, 1 V. L. Ermakov, 1 O. I. Gnezdilov, 2 UDC 621.315.592 E. V. Shmidt, 1 A. N. Safonov, 1 T. G. Aminov, 3 and G. G. Shabunina 3 The synthesized base compound CuGaTe 2 and the Mn-doped compounds Cu 0.97 Ga 0.97 Mn 0.06 Te 2 and Cu 0.93 Ga 0.93 Mn 0.14 Te 2 have been investigated by using 63 Cu and 69 Ga NMR spectroscopy. The NMR spectra obtained testify to substantial structural distortions near the cationic positions in the crystal lattice of Mn- doped samples. The constants of quadrupole coupling between 63 Cu and 69 Ga nuclei in the compounds investigated have been estimated. Keywords: Spintronics, nuclear magnetic resonance, chalcopyrite semiconductors, doping. INTRODUCTION Compounds having the crystal structure of chalcopyrite doped with Mn are candidates for using in spintronic devices owing to their rather high temperatures of magnetic ordering and adaptability to manufacture in the form of high-quality single crystals and films [1]. It is well known that the materials that are suppliers of spin-polarized electrons should meet the requirement of ferromagnetism at temperatures higher than room temperature combined with the conductivity of semiconductors. First investigations on the creation of spintronic materials were associated with type А III В V {Mn} diluted magnetic semiconductors. The next step was the production of high-temperature ferromagnetic semiconductors of the А II В IV C V 2 {Mn} type. Semiconductor compounds of the A I B III C VI 2 type, having the structure of chalcopyrite, also meet these requirements. They show high mobility of charging carriers. The transition element (Mn, Fe, etc.) atoms take structural positions in anionic and cationic sublattices of these compounds thereby changing the band structure, and this can provide the transition of the material into a ferromagnetic state with a rather high Curie temperature and with the basic semiconductor properties preserved. The goal of this work was to investigate solid solutions of CuGaTe 2 {Mn} with double substitution in cationic sublattices by using 63 Cu and 69 Ga nuclear magnetic resonance (NMR). Previous investigations of chalcopyrite compounds by using 63 Cu, 115 In, and 69 Ga NMR made it possible to obtain valuable data on the structural and dynamic properties of these compounds, including the characteristics of nuclear quadrupole interactions and the coefficient of diffusion of Cu(I) at high temperatures [2–6]. At the same time, it should be noted that of all the family of semiconductor compounds having the crystal structure of chalcopyrite, tellurides are rather poorly understood compared to selenides and sulfides. The compound CuGaTe 2 is a diamagnetic, and its physical properties have been only recently determined on the single-crystal samples grown up by the Bridgeman method (sample I) and by the tellurization method (sample II) [7]. All the crystals produced possessed p-type conductivity, which retained on annealings in vacuum or in gallium vapor. The reason for this seems to be the high concentration of intrinsic defects resulting from the initial deviation of the compound composition from stoichometry. The concentration of holes in sample I decreased with decreasing temperature, indicating that the mechanism of conductivity was related to the thermal activation of charge carriers from 1 Kazan State Power Engineering University, Kazan, Russia; 2 E. K. Zavosky Kazan Physicotechnical Institute of the Kazan Science Center of the Russian Academy of Sciences, Kazan, Russia; 3 N. S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Moscow, Russia, e-mail: alx_rus@mail.ru. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 16–19, August, 2009. Original article submitted March 16, 2009. 1064-8887/09/5208-0785 ©2009 Springer Science+Business Media, Inc.