Bulk photovoltaic effect in hexagonal LuMnO3 single crystals
Yunwei Sheng, Ignasi Fina,* Marin Gospodinov, Aaron M. Schankler Andrew M. Rappe, and Josep Fontcuberta,* Physical ReviewB 104, 184116 (2021); DOI: doi.org/10.1103/PhysRevB.104.184116 Abstract When illuminating a non-centrosymmetric material with light of energy higher than the bandgap, a net current appears because the electrons do not see the same electronic environment […]
Positive Effect of Parasitic Monoclinic Phase of Hf0.5Zr0.5O2 on Ferroelectric Endurance
Tingfeng Song, Saúl Estandía, Huan Tan, Nico Dix, Jaume Gàzquez, Ignasi Fina,* Florencio Sánchez* Inorb. Adv. Electron. Mater. 2021, 2100420; DOI: doi.org/10.1002/aelm.202100420 Abstract Endurance of ferroelectric HfO2 needs to be enhanced for its use in commercial memories. This work investigates fatigue in epitaxial Hf0.5Zr0.5O2 (HZO) instead of polycrystalline samples. Using different substrates, […]
High-Temperature Synthesis and Dielectric Properties of LaTaON2
Augustin Castets, Ignasi Fina, Jhonatan R. Guarín, Judith Oró-Solé, Carlos Frontera, Clemens Ritter, Josep Fontcuberta*, and Amparo Fuertes* Inorg. Chem. 2021, 60, 16484−16491; DOI: doi.org/10.1021/acs.inorgchem.1c02325 Abstract The development of new synthetic methodologies of perovskite oxynitrides is challenging but necessary for the search of new compounds and the investigation of their […]
Switchable photovoltaic response in hexagonal LuMnO3 single crystals
Yunwei Sheng, Ignasi Fina, Marin Gospodinov, and Josep Fontcuberta Appl. Phys. Lett. 118, 232902 (2021); DOI: doi.org/10.1063/5.0053379 Abstract Hexagonal manganites, such as h-LuMnO3, are ferroelectric with its polar axis along the hexagonal axis and have a narrow electronic bandgap (≈1.5 eV). Using Pt electrodes, h-LuMnO3 single crystals display a strong rectification, characteristic of a […]
Orbital occupancy and hybridization in strained SrVO3 epitaxial films
Mathieu Mirjolet , Hari Babu Vasili, Adrian Valadkhani, José Santiso , Vladislav Borisov, Pierluigi Gargiani, Manuel Valvidares, Roser Valentí , and Josep Fontcuberta Phys Rev. Materials 5, 095002 (2021), DOI:10.1103/PhysRevMaterials.5.09500212K Abstract Strain is a knob that allows tuning the electronic bandwidth or the electronic distribution within the atomic orbitals is solids, to […]
Thickness effect on ferroelectric properties of La-doped HfO2 epitaxial films down to 4.5 nm
Tingfeng Song, Romain Bachelet, Guillaume Saint-Girons, Nico Dix, Ignasi Fina and Florencio Sanchez J. Mater. Chem. C, 2021, DOI: doi.org/10.1039/D1TC02512K Abstract Stabilization of the orthorhombic phase of HfO2 with La allows very high polarization and endurance. However, these properties have not been confirmed yet in films having thickness of less than 10 […]
Electron–Phonon Coupling and Electron–Phonon Scattering in SrVO3
M. Mirjolet, F. Rivadulla, P. Marsik, V. Borisov, R. Valentí, J. Fontcuberta, J. Adv. Sci. 2021, 2004207. https://doi.org/; DOI:doi.org/10.1002/advs.202004207 Abstract The nature of electron-electron and electron-lattice interactions in metallic oxides is revised. The common wisdom is that the strong correlations among electrons determine their properties. Here we argue […]
Optical Plasmon Excitations in Transparent Conducting SrNbO3 and SrVO3 Thin Films
Mathieu Mirjolet, Mikko Kataja, Tommi K. Hakala, Philipp Komissinskiy, Lambert Alff, Gervasi Herranz, Josep Fontcuberta, Adv. Opt. Materials First published: 14 June 2021; DOI:doi.org/10.1002/adom.202100520 Abstract From catalysis and flat panel displays to photovoltaics, transparent and conducting transition metal oxides are gaining momentum toward more sustainable and cost-efficient applications. Here it […]
Stabilization of the Ferroelectric Phase in Epitaxial Hf1–xZrxO2 Enabling Coexistence of Ferroelectric and Enhanced Piezoelectric Properties
Tingfeng Song, Huan Tan, Nico Dix, Rahma Moalla, Jike Lyu, Guillaume Saint-Girons, Romain Bachelet, Florencio Sánchez, and Ignasi Fina ACS Appl. Electron. Mater. 2021, 3, 5, 2106–2113 (2021); DOI:doi.org/10.1021/acsaelm.1c00122 Abstract Systematic studies on polycrystalline Hf1–xZrxO2 films with varying Zr contents show that HfO2 films are paraelectric (monoclinic). If the Zr content is […]
