Abstract
Results of studying the paramagnetic and ordered phases of a CuCrO2 single crystal using nuclear magnetic and nuclear quadrupole resonances on 63,65Cu nuclei are presented. The measurements have been carried out in wide ranges of temperature (T = 4.2–300 K) and magnetic-field strength (Н = 0–94 kOe), with the magnetic fields being directed along a and c axes of the crystal. The components of the electric-field gradient tensor and the magnetic-shift tensor (K a,c) have been determined. The temperature dependences K a(H || a) and K c(H || c) for the paramagnetic phase are described by the Curie–Weiss law and reproduce the behavior of the magnetic susceptibility (χa,c). The hyperfine field on a copper nucleus has been determined, which is equal to h a,c hf = 33 kOe/μB. Below the temperature Т N = 23.6 K, nuclear magnetic resonance and nuclear quadrupole resonance spectra for 63,65Cu nuclei have been recorded typical of helical magnetic structures, which are incommensurable with the lattice period.
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Original Russian Text © A.G. Smol’nikov, V.V. Ogloblichev, S.V. Verkhovskii, K.N. Mikhalev, A.Yu. Yakubovskii, Y. Furukawa, Yu.V. Piskunov, A.F. Sadykov, S.N. Barilo, S.V. Shiryaev, 2017, published in Fizika Metallov i Metallovedenie, 2017, Vol. 118, No. 2, pp. 142–150.
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Smol’nikov, A.G., Ogloblichev, V.V., Verkhovskii, S.V. et al. Specific features of magnetic order in a multiferroic compound CuCrO2 determined using NMR and NQR data for 63, 65Cu nuclei. Phys. Metals Metallogr. 118, 134–142 (2017). https://doi.org/10.1134/S0031918X17020120
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DOI: https://doi.org/10.1134/S0031918X17020120