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Nonlinear pressure dependence of TN in almost multiferroic EuTiO3
Z Guguchia1, K Caslin, R K Kremer
1Physik-Institut der Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
The antiferromagnetic transition temperature of EuTiO3 increases nonlinearly with pressure, demonstrating robust magnetic ordering. Exchange interactions also depend on pressure, aligning with experimental observations.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- EuTiO3 exhibits complex magnetic behavior.
- Understanding pressure effects on magnetic transitions is crucial for materials design.
Purpose of the Study:
- Investigate the antiferromagnetic (AFM) phase transition temperature (TN) of EuTiO3 under varying pressure.
- Analyze the pressure dependence of exchange interactions and Weiss temperature.
Main Methods:
- Experimental study of EuTiO3's TN as a function of pressure (p).
- Analysis using the Bloch power law model.
Main Results:
- A nonlinear increase in TN with increasing pressure was observed.
- Exchange interactions show a similar pressure dependence to TN.
- The AFM transition remains robust under pressure.
- Anomalous positive values for the Weiss temperature (ΘW) were consistently found.
Conclusions:
- The Bloch power law model accurately describes the experimental data.
- Pressure enhances the antiferromagnetic ordering in EuTiO3.
- The anomalous Weiss temperature suggests unique magnetic interactions in EuTiO3.
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