Thermally Induced High-Spin Low-Spin Transition in Co[Cr0.5Ga1.5]S4 Spinel
| Periodical | Solid State Phenomena (Volume 170) |
|---|---|
| Main Theme | Solid Compounds of Transition Elements |
| Edited by | J.-L. Bobet, B. Chevalier and D. Fruchart |
| Pages | 9-12 |
| DOI | 10.4028/www.scientific.net/SSP.170.9 |
| Citation | J. Krok-Kowalski et al., 2011, Solid State Phenomena, 170, 9 |
| Online since | April, 2011 |
| Authors | J. Krok-Kowalski, Ewa Maciążek, Tadeusz Groń, Andrzej W. Pacyna, Tadeusz Mydlarz, G. Władarz |
| Keywords | Crossover, Exchange Interaction, Spin Frustration, Superexchange Interactions |
| Price | US$ 28,- |
A high spin (HS) – low spin (LS) transition has been discovered in the Co[Cr0.5Ga1.5]S4 spinel, where the Co ions occupy tetrahedral sites and the Cr and Ga ions octahedral ones. The latter are diluted by the non-magnetic Ga-ions. Application of magnetic fields revealed ferrimagnetic order with a Curie temperature TC = 126 K, a strong suppression of the magnetic susceptibility () and a slight shift of TC to lower temperatures. A cusp at 15.6 K on the ac (T) curve suggests a spin frustration of the re-entrant type. Characteristic for the HS-LS transition is an inflection point at 150 K on the 1/(T) curve, a lack of the Curie-Weiss region above TC and a small value of the magnetization, 4.76 emu/g at 4.4 K and at a magnetic field of 57.5 kOe.
