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Spin Dynamics and Ground State of the Frustrated Diamond Lattice Magnet CoAl2O4 as seen by 27Al NMRстатья
- Авторы: Iakovleva M.F., Vavilova E.L., Grafe H.J., Maljuk A., Wurmehl S., Büchner B., Kataev V.
- Журнал: Applied Magnetic Resonance
- Том: 47
- Номер: 7
- Год издания: 2016
- Издательство: Springer Verlag
- Местоположение издательства: Germany
- Первая страница: 727
- Последняя страница: 735
- DOI: 10.1007/s00723-016-0773-9
- Аннотация: We report an experimental study of the low-temperature dynamics of electron spin fluctuations in the magnetically frustrated spinel CoAl2O4 as revealed by 27Al nuclear magnetic relaxation measurements in a magnetic field of 7.7 T in the temperature range 4 < T < 240 K. With this local probe technique, we show that the dynamics of the correlated Co spins strongly depends on the frustration of spin interactions and on Co/Al site disorder. The anisotropy of the temperature dependences of the spin–lattice (T−11) and spin–spin (T−12) 27Al nuclear relaxation rates reveals a coexistence of the short-range Néel order below a characteristic temperature T * = 8 K and slow non-commensurate magnetic correlations below and above T *, in agreement with the results of neutron diffraction experiments and our previous NMR spectroscopy data.
- Добавил в систему: Вавилова Евгения Леонидовна