Specific features of magnetic order in a multiferroic compound CuCrO2 determined using NMR and NQR data for 63, 65Cu nuclei
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 ( H = 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 hf a,c = 33 kOe/μB. Below the temperature T 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.
- Publication:
-
Physics of Metals and Metallography
- Pub Date:
- February 2017
- DOI:
- 10.1134/S0031918X17020120
- Bibcode:
- 2017PMM...118..134S
- Keywords:
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- nuclear magnetic resonance;
- multiferroic compounds;
- frustrated systems;
- helical magnetic structure