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http://hdl.handle.net/10773/36539
Title: | Magnetic ordering in Co2+-containing layered double hydroxides via the low-temperature heat capacity and magnetisation study |
Author: | Pashkevich, Yu.G. Fertman, E.L. Fedorchenko, A.V. Vieira, D. E. L. Neves, C. S. Babkin, R.Yu. Lyogenkaya, A.А. Tarasenko, R. Tkáč, V. Čižmár, E. Feher, A. Salak, A.N. |
Keywords: | Layered double hydroxide Heat capacity Schottky-like anomaly Magnetic ordering |
Issue Date: | 1-Mar-2023 |
Publisher: | Elsevier |
Abstract: | The low-temperature heat capacity and the magnetisation of Co2+ n Al3+ layered double hydroxides (LDH) with the cobalt-to-aluminium ratio n = 2 and 3 and intercalated with different anions have been studied in a wide range of magnetic fields up to 50 kOe. The heat capacity, C(T), was found to demonstrate a Schottky-like anomaly observed as a broad local maximum in the temperature dependence below 10 K. The effect is caused by a splitting of the ground-state Kramers doublet of Co2+ in the internal exchange field and correlates with magnetic ordering in these LDH. In low applied fields, the temperature-dependent dc magnetic susceptibility demonstrates a pronounced rise, which is associated with an onset of magnetic ordering. Both the heat capacity anomaly and the magnetic susceptibility peak are more pronounced for the LDH with n = 2 than for those with n = 3. This feature is associated with an excess of the honeycomb-like Co–Al coordination (which corresponds to a 2:1 Co–Al ordering) over the statistical cation distribution in Co2Al LDH, while a rather random cobalt-aluminium distribution is typical for Co3Al LDH. The temperature of the Schottky-like anomaly measured in a zero field is independent of the interlayer distance. Application of the magnetic field results in a widening of the anomaly range and a shift to higher temperatures. The observed experimental data are typical for a cluster spin glass ground state. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/36539 |
DOI: | 10.1016/j.clay.2023.106843 |
ISSN: | 0169-1317 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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acs233_106843.pdf | 2.49 MB | Adobe PDF | View/Open |
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