High pressure induced spin state crossover in Sr2CaYCo4O10.5
V Sikolenko1, I Troyanchuk, M Bushinsky
1Helmholtz-Zentrum Berlin, 14109 Berlin, Germany. Joint Institute for Nuclear Research, 141980 Dubna, Russia. Institute of Applied Geosciences, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
Pressure suppresses magnetic order in the layered cobaltite Sr(2)CaYCo(4)O(10.5). Neutron powder diffraction reveals a transition to a non-magnetic state at 3.5 GPa, linked to a cobalt spin-state change.
Area of Science:
- Solid State Chemistry
- Materials Science
- Magnetism
Background:
- Layered cobaltites exhibit complex magnetic and electronic properties.
- Understanding structure-property relationships is crucial for materials design.
Purpose of the Study:
- To investigate the effects of pressure on the crystal and magnetic structure of Sr(2)CaYCo(4)O(10.5).
- To determine the pressure-induced magnetic transitions and their underlying mechanisms.
Main Methods:
- Neutron powder diffraction (NPD) was employed to study the material.
- Experiments were conducted as a function of temperature and pressure up to 4 GPa.
Main Results:
- The crystal structure is tetragonal (space group I4/mmm).
- An ambient pressure G-type antiferromagnetic structure with TN ~ 310 K was observed.
- Magnetic moments were determined for different cobalt sites.
- Long-range magnetic order was suppressed at 3.5 GPa and 25 K.
Conclusions:
- Pressure effectively suppresses magnetic order in Sr(2)CaYCo(4)O(10.5).
- The suppression is attributed to a pressure-induced high-to-low spin state crossover in Co(3+) ions.
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