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Pressure-induced phase transitions and correlation between structure and superconductivity in iron-based
Jinggeng Zhao1, Haozhe Liu, Lars Ehm
1Natural Science Research Center, Academy of Fundamental and Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China. zhaojinggeng@gmail.com
Inorganic Chemistry
|July 3, 2013
Summary
High pressure transforms iron-based superconductor Ce(O(0.84)F(0.16))FeAs into a new tetragonal phase. This structural change drastically reduces superconductivity, highlighting the role of lanthanide cation size in 1111-type superconductors.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Iron-based superconductors, particularly the 1111-type, exhibit complex behaviors under pressure.
- Understanding structural phase transitions is crucial for tuning superconducting properties.
Purpose of the Study:
- To investigate the structural evolution of Ce(O(0.84)F(0.16))FeAs under high pressure.
- To correlate structural changes with alterations in superconducting transition temperature (Tc).
Main Methods:
- High-pressure angle-dispersive X-ray diffraction experiments were conducted up to 54.9 GPa at room temperature.
- Structural analysis focused on bond distances and angles within the material.
Main Results:
- An isostructural phase transition was observed starting around 13.9 GPa.
- A new high-pressure tetragonal phase emerged above 33.8 GPa, characterized by an expanded a-axis and contracted c-axis.
- Discontinuities in bond distances and angles were noted in the transition region, correlating with a drop in Tc.
Conclusions:
- The high-pressure structural transition in Ce(O(0.84)F(0.16))FeAs significantly suppresses superconductivity.
- The study reinforces the relationship between lanthanide cation radius, structural evolution, and superconductivity in 1111-type iron-based superconductors under pressure.
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