Hydrothermal epitaxy and resultant properties of EuTiO3 films on SrTiO3(001) substrate

Lv, Fengzhen; Zhang, Jing; Gao, Cunxu; i, L; Gao, Daqiang; Zhou, Shiming; Xue, Desheng

doi:10.1186/1556-276x-9-266

Cited by 10 publications

(9 citation statements)

References 33 publications

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“…In the 2-4 phase, the filled Eu majority-spin 4f 7 manifold forms the top of the largely O2p -Mn3d hybridized valence band, with the bottom of the conduction band deriving from empty Mn 3d states. The 4f 7 dominated valence-band edge is consistent with XPS data for EuTiO 3 that also contains primarily Eu 2+ ions; these spectra also show small Eu 3+ contributions at 10 to 15 eV lower energies [42][43][44] . The 2-4 phase thus has a Eu f -Mn eg gap whereas the 3-3 has a Mn eg -Mn eg /Eu f gap, and we anticipate strongly different transport behavior of electrons and holes in the two phases.…”

Section: B Signatures Of the Phases And Phase Transitionsupporting

confidence: 81%

Strain-induced heteronuclear charge disproportionation in EuMnO3

Vonrüti

Spaldin

2019

Phys. Rev. Materials

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Charge disproportionation transitions in complex oxides most commonly link high-temperature phases containing identical cations with the same oxidation state and crystallographic site, to lowtemperature phases in which charge transfer between these ions results in unequal oxidation states.Here we propose, based on density functional calculations, a related concept that we term heteronuclear charge disproportionation, in which charge transfer occurs between different elements on different crystallographic sites. We show for the case of EuMnO3 that such a transition from the experimentally observed Eu 3+ Mn 3+ O3 phase to the so far unknown Eu 2+ Mn 4+ O3 phase can be triggered by pressure and epitaxial strain. We then identify measurable signatures to aid in an experimental exploration of the complex pressure-and biaxial strain-dependent phase stability of EuMnO3 that we hope to motivate with our predictions. We suggest other candidate crystal chemistries for heteronuclear charge disproportionation, in which novel physics could emerge from the coexistence of instabilities. arXiv:1810.09204v1 [cond-mat.mtrl-sci]

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Section: B Signatures Of the Phases And Phase Transitionsupporting

confidence: 81%

Strain-induced heteronuclear charge disproportionation in EuMnO3

Vonrüti

Spaldin

2019

Phys. Rev. Materials

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“…Thin films of ETO have been fabricated by various groups910111213, however, all being unable to overcome the leakage problem. Here we report on results from films of ETO deposited on a thin STO substrate which are highly transparent, single crystalline, cubic at room temperature, and strain/stress free.…”

Section: Resultsmentioning

confidence: 99%

“…Bulk samples of ETO are available only as tiny single crystal or in ceramic form and exhibit large leakage currents which make them unsuited for optical measurements. Thin films of ETO have been fabricated by various groups [9][10][11][12][13], however, all being unable to overcome the leakage problem. Here we report on results from films of ETO deposited on a thin STO substrate which are highly transparent, single crystalline, cubic at room temperature, and strain/stress free.…”

Section: Resultsmentioning

confidence: 99%

Transparent EuTiO3 films: a possible two-dimensional magneto-optical device

Bussmann‐Holder

Roleder

Stuhlhofer

et al. 2017

Sci Rep

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The magneto-optical activity of high quality transparent thin films of insulating EuTiO3 (ETO) deposited on a thin SrTiO3 (STO) substrate, both being non-magnetic materials, are demonstrated to be a versatile tool for light modulation. The operating temperature is close to room temperature and allows for multiple device engineering. By using small magnetic fields birefringence of the samples can be switched off and on. Similarly, rotation of the sample in the field can modify its birefringence Δn. In addition, Δn can be increased by a factor of 4 in very modest fields with simultaneously enhancing the operating temperature by almost 100 K.

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“…Thin films of ETO of 1000 nm thickness have been grown on a SrTiO 3 substrate and characterized by magnetic susceptibility measurements, ellipsometry, x-ray diffraction (XRD), and birefringence. The samples are highly transparent with a large band gap [15], much larger than reported before, exhibit no leakage currents (a problem encountered in previously investigated films [5,16,17]), and are strain free and single crystalline. They become antiferromagnetic below T N = 5.2 K, and undergo a structural instability from cubic to tetragonal at T S = 282 K, as found for bulk ETO.…”

mentioning

confidence: 80%