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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.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|November 7, 2012

Summary

This summary is machine-generated.

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.

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Published on: April 12, 2019

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.