17 O NMR study of the triangular lattice antiferromagnet CuCrO 2
| Autor: | Sergei N. Barilo, Y. V. Piskunov, A. F. Sadykov, A. Yakubovsky, A. S. Belozerov, Ken-ichi Kumagai, K. N. Mikhalev, A. Gerashenko, S. V. Shiryaev, A. G. Smol’nikov, Yuji Furukawa, V. V. Ogloblichev |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Magnetic moment Condensed matter physics Magnetic structure 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Paramagnetism Dipole 0103 physical sciences Quadrupole Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Hyperfine structure Electric field gradient |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 458:1-9 |
| ISSN: | 0304-8853 |
| Popis: | The single crystalline and powder samples of multiferroic CuCrO2 have been investigated by 17O NMR techniques in the paramagnetic and magnetically ordered states. The unusual negative hyperfine field on oxygen nuclei, Hhf = −5.2 kOe/µB, has been determined in paramagnetic state. The 17O NMR spectrum in ordered state has a shape typical for incommensurate magnetic structure. It can be well described taking into account only dipole fields which are produced by Cr3+-ions with magnetic moment μ = 2.2 μB. The parameters of the EFG (electric field gradient) tensor – the quadrupole frequency (νQ) and the asymmetry parameter, have been determined. The value of νQ increases monotonously with decreasing temperature in the range 90 K > T > 1.5 K. The estimates of the population of the ligands p – orbitals have been obtained. |
| Databáze: | OpenAIRE |
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