HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Magnetodielectric coupling and multi-blocking effect in the Ising-chain magnet Sr 2 Ca 2 CoMn 2 O 9

Abstract : We have demonstrated magnetodielectric (MD) coupling in an Ising-chain magnet Sr 2 Ca 2 CoMn 2 O 9 via detailed investigation of ac susceptibility and dielectric constant as a function of temperature, magnetic field, and frequency. Sr 2 Ca 2 CoMn 2 O 9 consists of spin-chains made of the regular stacking of one CoO 6 trigonal prism with two MnO 6 octahedra. The (Co 2+-Mn 4+-Mn 4+) unit stabilizes a (↑↓↑) spin-state along the chains that are distributed on a triangular lattice. This compound undergoes a partially disordered antiferromagnetic transition at T N ∼ 28 K. The dielectric constant exhibits a clear peak at T N only in the presence of an external magnetic field (H ≥ 5 kOe), evidencing the presence of MD coupling, which is further confirmed by field-dependent dielectric measurements. We argue that spatial inversion symmetry can be broken as a result of exchange-striction along each spin chain, inducing uncompensated local dipoles. At low temperatures, a dipolar relaxation phenomenon is observed, bearing strong similarities to the blocking effect typical of spin dynamics in this compound. Such a spin-dipole relationship is referred to as a "multiblocking" effect, in relation to the concept of magnetodielectric "multiglass" previously introduced for related materials.
Complete list of metadata

https://hal-cnrs.archives-ouvertes.fr/hal-03429358
Contributor : Olivier Perez Connect in order to contact the contributor
Submitted on : Thursday, November 18, 2021 - 4:08:02 PM
Last modification on : Tuesday, April 5, 2022 - 12:07:48 PM
Long-term archiving on: : Saturday, February 19, 2022 - 6:08:34 PM

File

Magnetodielectric coupling (1)...
Files produced by the author(s)

Identifiers

Citation

T. Basu, N. Sakly, A. Pautrat, F. Veillon, O. Pérez, et al.. Magnetodielectric coupling and multi-blocking effect in the Ising-chain magnet Sr 2 Ca 2 CoMn 2 O 9. Journal of Applied Physics, American Institute of Physics, 2021, 130 (3), pp.034102. ⟨10.1063/5.0056149⟩. ⟨hal-03429358⟩

Share

Metrics

Record views

20

Files downloads

31