Magnetic phenomena in Co-containing layered double hydroxides

• Published in: Физика низких температур
• Date: 2017
• Main Authors: Vieira, D.E.L., Salak, A.N., Fedorchenko, A.V., Pashkevich, Y.G., Fertman, E.L., Desnenko, V.A., Babkin, R.Y., Čižmár, E., Feher, A., Lopes, A.B., Ferreira, M.G.S.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2017
• Subjects: Low dimensionality and inhomogeneity effects in quantum matter
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/175128
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Magnetic phenomena in Co-containing layered double hydroxides / D.E.L. Vieira, A.N. Salak, A.V. Fedorchenko, Y.G. Pashkevich, E.L. Fertman, V.A. Desnenko, R.Y. Babkin, E. Čižmár, A. Feher, A.B. Lopes, M.G.S. Ferreira // Физика низких температур. — 2017. — Т. 43, № 8. — С. 1214-1218. — Бібліогр.: 17 назв. — англ.

Magnetic behavior of CoII(n)AlIII layered double hydroxides (LDHs) (n = Co/Al = 2 and 3) intercalated with nitrate was studied as a function of temperature. Both LDH compounds are paramagnetic above about 8 K. A rapid increase of their magnetic moments occurs below this temperature until the moments reach the maximum values at Tmax of 4.0 K and 3.2 K for Co(2)Al–NO₃ and Co(3)Al–NO₃, respectively. Below Tmax, the zero-field-cooled and the field-cooled static magnetization curves are strongly different. Along with this low-temperature phenomena, Co(2)Al–NO₃ and Co(3)Al–NO₃ demonstrate anomalous behavior of their temperature dependence magnetic susceptibility in a higher-temperature range: between 75 and 175 K, both the paramagnetic Curie temperature and the effective magnetic moment change in a non-monotonous way. Possible structural reasons of the observed magnetic behavior of the CoII(n)AlIII LDHs are discussed.