Making EuO multiferroic by epitaxial strain engineering
| العنوان: | Making EuO multiferroic by epitaxial strain engineering |
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| المؤلفون: | Nicola A. Spaldin, Rainer Held, Stanislav Kamba, Darrell G. Schlom, Venkatraman Gopalan, Eric Bousquet, Veronica Goian, Phillipe Ghosez, Alexander Melville, Yakun Yuan, Hua Zhou |
| المصدر: | Communications Materials, Vol 1, Iss 1, Pp 1-10 (2020) Communications Materials, 1 (1) |
| بيانات النشر: | Nature Publishing Group, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Phase transition, Materials science, Condensed matter physics, 02 engineering and technology, Soft modes, 021001 nanoscience & nanotechnology, 01 natural sciences, Ferroelectricity, Hybrid functional, Condensed Matter::Materials Science, Strain engineering, Ferromagnetism, Mechanics of Materials, 0103 physical sciences, lcsh:TA401-492, Antiferromagnetism, General Materials Science, Multiferroics, Condensed Matter::Strongly Correlated Electrons, lcsh:Materials of engineering and construction. Mechanics of materials, 010306 general physics, 0210 nano-technology |
| الوصف: | Multiferroics are materials exhibiting the coexistence of ferroelectricity and ideally ferromagnetism. Unfortunately, most known magnetoelectric multiferroics combine ferroelectricity with antiferromagnetism or with weak ferromagnetism. Here, following previous theoretical predictions, we provide clear experimental indications that ferroelectricity can be induced by epitaxial tensile strain in the ferromagnetic simple binary oxide EuO. We investigate the ferroelectric phase transition using infrared reflectance spectroscopy, finding that the frequency of the soft optical phonon reduces with increasing tensile strain and decreasing temperature. We observe such a soft mode anomaly at 100 K in (EuO)2/(BaO)2 superlattices grown epitaxially on (LaAlO3)0.29-(SrAl1/2Ta1/2O3)0.71 substrates, which is a typical signature for a displacive ferroelectric phase transition. The EuO in this superlattice is nominally subjected to 6.4% biaxial tensile strain, i.e., 50% more than believed needed from previously published calculations. We interpret our results with new first-principles density functional calculations using a hybrid functional, which provides a better quantitative agreement with experiment than the previously used local-density approximation and generalized gradient approximation functionals. Communications Materials, 1 (1) ISSN:2662-4443 |
| وصف الملف: | application/application/pdf |
| اللغة: | English |
| تدمد: | 2662-4443 |
| DOI: | 10.1038/s43246-020-00075-1 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb7f48019459f664f316f5694764387d http://link.springer.com/article/10.1038/s43246-020-00075-1 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....cb7f48019459f664f316f5694764387d |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 26624443 |
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| DOI: | 10.1038/s43246-020-00075-1 |