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Excellent Barocaloric Effect by Modulating Geometrical Frustrations in Mn3Pt
Feixiang Long1, Yuzhu Song1, Fuyang Tian2
1Department of Physical Chemistry, Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Researchers discovered a large barocaloric effect (BCE) in Mn3Pt, driven by low pressure. This finding, modulated by geometrical frustration, advances green solid-state cooling technology.
Area of Science:
- Materials Science
- Solid-State Physics
- Thermodynamics
Background:
- Barocaloric materials offer green and efficient solid-state cooling.
- Low-pressure-driven barocaloric materials are key for widespread refrigeration applications.
Purpose of the Study:
- To reveal the low-pressure-driven barocaloric effect (BCE) modulated by geometrical frustrations in Mn3Pt.
- To establish a model for the dual effect of geometrical frustration in magnets.
Main Methods:
- Neutron powder diffraction.
- First-principles calculations.
- Analysis of geometrical frustration effects on magnetic phase transitions.
Main Results:
- Mn3Pt exhibits a large, low-pressure-driven BCE.
- Achieved a temperature-change strength of 9.77 K/MPa, the highest among metal BCE materials.
- Geometrical frustration induces giant volume expansion and enhances magnetic phase transition sensitivity.
Conclusions:
- Geometrical frustration plays a dual role in modulating the barocaloric effect in Mn3Pt.
- The established model promotes research in barocaloric refrigeration devices.
- This work paves the way for efficient, low-pressure solid-state cooling technologies.
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