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Magnetic field enhanced structural instability in EuTiO3
Z Guguchia1, H Keller, J Köhler
1Physik-Institut der Universität Zürich, Winterthurerstraße 190, CH-8057 Zürich, Switzerland.
Applying a magnetic field to Europium titanate (EuTiO3) shifts its structural phase transition to higher temperatures. This effect, driven by coupled spin-phonon interactions, aligns with theoretical predictions.
Area of Science:
- Solid State Physics
- Materials Science
- Crystallography
Background:
- Europium titanate (EuTiO3) exhibits a cubic to tetragonal structural phase transition at 282 K.
- This transition is linked to oxygen octahedral rotations driven by acoustic mode softening.
- No long-range magnetic order accompanies this structural change.
Purpose of the Study:
- To investigate the influence of an external magnetic field on the structural phase transition temperature of EuTiO3.
- To experimentally verify theoretical predictions regarding spin-phonon coupling in EuTiO3.
Main Methods:
- Experimental application of external magnetic fields up to 9 Tesla.
- Precise measurement of the structural phase transition temperature (T(S)) under varying magnetic fields.
- Comparison of experimental results with theoretical models.
Main Results:
- The structural phase transition temperature (T(S)) of EuTiO3 increases with the application of an external magnetic field.
- A shift of approximately 4 K in T(S) was observed for a magnetic field of 9 Tesla.
- The experimental findings are consistent with theoretical predictions.
Conclusions:
- External magnetic fields can effectively tune the structural phase transition temperature in EuTiO3.
- The observed magnetostructural coupling is attributed to interactions between spin, lattice anharmonicity, and phonons.
- This study highlights the potential for magnetic fields to control structural properties in materials.
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