Pressure-Induced Collapse of Magnetic Order in Jarosite
Ryan A Klein1, James P S Walsh1, Samantha M Clarke2
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
Physical Review Letters
|August 29, 2020
Summary
High pressure induces a phase transition in frustrated kagomé jarosite around 45 GPa, causing magnetic order to vanish. This transition results in a twisted kagomé lattice, potentially leading to a quantum paramagnetic phase.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Jarosite is a frustrated kagomé material exhibiting complex magnetic properties.
- Understanding pressure-induced effects is crucial for exploring novel quantum states.
Purpose of the Study:
- To investigate the pressure-induced phase transition in jarosite.
- To characterize the structural, electronic, and magnetic changes accompanying this transition.
- To elucidate the impact of pressure on the magnetic ordering in jarosite.
Main Methods:
- Synchrotron powder X-ray diffraction
- Fourier transform infrared spectroscopy
- Density functional theory calculations
Main Results:
- A pressure-induced phase transition observed at approximately 45 GPa.
- Structural transformation from R3[over ¯]m to R3[over ¯]c space group.
- Disappearance of magnetic order and formation of a twisted kagomé lattice.
Conclusions:
- The high-pressure phase of jarosite features a unique twisted kagomé structure.
- Symmetry changes suggest a shift towards a quantum paramagnetic phase at elevated pressures.
- This study provides insights into pressure-tuning of magnetic interactions in frustrated systems.
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