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View article: Coexistence of Insulatorlike Paramagnon and Metallic Spin-Orbit Exciton Modes in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>SrIrO</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>3</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math>
Coexistence of Insulatorlike Paramagnon and Metallic Spin-Orbit Exciton Modes in Open
We probe the spectrum of elementary excitations in SrIrO 3 by using heterostructured [ ( SrIrO 3 ) m / ( SrTiO 3 ) l ] samples to approach the bulk limit. Our resonant inelastic x-ray scattering (R…
View article: <i>A</i>CrF<sub>3</sub> Jahn–Teller-Distorted Fluoroperovskites: Expanding to RbCrF<sub>3</sub> and CsCrF<sub>3</sub>
<i>A</i>CrF<sub>3</sub> Jahn–Teller-Distorted Fluoroperovskites: Expanding to RbCrF<sub>3</sub> and CsCrF<sub>3</sub> Open
The Jahn-Teller effect significantly affects the CrF6 octahedra in Cr(II) fluoroperovskites. Here, we report the synthesis, crystal structures, and magnetic properties of RbCrF3 and CsCrF3, thereby completing a comprehensive investigation …
View article: Multi-UAV Trajectory Optimization Under Dynamic Threats: An Enhanced GWO Algorithm Integrating a Priori and Real-Time Data
Multi-UAV Trajectory Optimization Under Dynamic Threats: An Enhanced GWO Algorithm Integrating a Priori and Real-Time Data Open
Though the widespread use of multi-UAV systems offers significant tactical and operational advantages, achieving efficient and secure collaborative planning remains a critical challenge in dynamic threat environments. Traditional methods s…
View article: Intrinsic three-dimensional topology in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">SrNbO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> films
Intrinsic three-dimensional topology in films Open
Transition metal oxides, with their wide range of electronic and magnetic properties, offer a remarkable platform for developing future electronics based on unconventional quantum phenomena, such as topological phases. The formation of top…
View article: Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO$_3$
Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO$_3$ Open
We probe the spectrum of elementary excitations in SrIrO$_3$ by using heterostructured [(SrIrO$_3$)$_m$/(SrTiO$_3$)$_l$] samples to approach the bulk limit. Our resonant inelastic x-ray scattering (RIXS) measurements at the Ir $L_3$-edge r…
View article: Order-to-Disorder Transition and Hydrogen Bonding in the Jahn–Teller Active NH<sub>4</sub>CrF<sub>3</sub> Fluoroperovskite
Order-to-Disorder Transition and Hydrogen Bonding in the Jahn–Teller Active NH<sub>4</sub>CrF<sub>3</sub> Fluoroperovskite Open
Large quantities of high-purity NH4CrF3 have been synthesized using a wet-chemical method, and its structural chemistry and magnetic properties are investigated in detail for the first time. NH4CrF3 is a tetragonal fluoroperovskite that di…
View article: Robust multiferroicity and magnetic modulation of the ferroelectric imprint field in heterostructures comprising epitaxial Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> and Co
Robust multiferroicity and magnetic modulation of the ferroelectric imprint field in heterostructures comprising epitaxial Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> and Co Open
Magnetoelectric composite multiferroic comprising ferroelectric doped HfO 2 and ferromagnetic cobalt coupled films is demonstrated to be a promising candidate for energy efficient memory computing.
View article: Provoking topology by octahedral tilting in strained SrNbO$_3$
Provoking topology by octahedral tilting in strained SrNbO$_3$ Open
Transition metal oxides with a wide variety of electronic and magnetic properties offer an extraordinary possibility to be a platform for developing future electronics based on unconventional quantum phenomena, for instance, the topology. …
View article: Cobalt-free layered perovskites RBaCuFeO<sub>5+<i>δ</i></sub> (R = 4f lanthanide) as electrocatalysts for the oxygen evolution reaction
Cobalt-free layered perovskites RBaCuFeO<sub>5+<i>δ</i></sub> (R = 4f lanthanide) as electrocatalysts for the oxygen evolution reaction Open
O K-edge XAS measurements reveal a surface reconstruction in RBaCuFeO 5+ δ layered perovskites when δ > 0. Oxygen excess, together with some degree of A-site cation intermixing, appears to control the OER activity in these Co-free electroc…
View article: Microscopic study of the impurity effect in the kagome superconductor La(Ru$_{1-x}$Fe$_{x}$)$_{3}$Si$_{2}$
Microscopic study of the impurity effect in the kagome superconductor La(Ru$_{1-x}$Fe$_{x}$)$_{3}$Si$_{2}$ Open
We report on the effect of magnetic impurities on the microscopic superconducting (SC) properties of the kagome-lattice superconductor La(Ru$_{1-x}$Fe$_{x}$)$_{3}$Si$_{2}$ using muon spin relaxation/rotation. A strong suppression of the su…
View article: Catalyst Aggregate Size Effect on the Mass Transport Properties of Non-Noble Metal Catalyst Layers for PEMFC Cathodes
Catalyst Aggregate Size Effect on the Mass Transport Properties of Non-Noble Metal Catalyst Layers for PEMFC Cathodes Open
Non-noble metal catalysts (NNMCs) are regarded as a promising alternative to the costly Pt-based materials required to catalyze the oxygen reduction reaction (ORR) in proton exchange membrane fuel cell (PEMFC) cathodes. However, the large …
View article: Structural Evolution and Onset of the Density Wave Transition in the CDW Superconductor LaPt$_2$Si$_2$ Clarified with Synchrotron XRD
Structural Evolution and Onset of the Density Wave Transition in the CDW Superconductor LaPt$_2$Si$_2$ Clarified with Synchrotron XRD Open
The quasi-2D Pt-based rare earth intermetallic material LaPt$_2$Si$_2$ has attracted attention as it exhibits strong interplay between charge density wave (CDW) and and superconductivity (SC). However, the most of the results reported on t…
View article: Control of up-to-down/down-to-up light-induced ferroelectric polarization reversal
Control of up-to-down/down-to-up light-induced ferroelectric polarization reversal Open
Control of the final state of polarization switched by illumination is achieved in BaTiO 3 films by the manipulation of the internal electric fields by using suitable bottom electrodes.
View article: Stabilization of the Ferroelectric Phase in Epitaxial Hf<sub>1–<i>x</i></sub>Zr<i><sub>x</sub></i>O<sub>2</sub> Enabling Coexistence of Ferroelectric and Enhanced Piezoelectric Properties
Stabilization of the Ferroelectric Phase in Epitaxial Hf<sub>1–<i>x</i></sub>Zr<i><sub>x</sub></i>O<sub>2</sub> Enabling Coexistence of Ferroelectric and Enhanced Piezoelectric Properties Open
Systematic studies on polycrystalline Hf1–xZrxO2 films with varying Zr contents show that HfO2 films are paraelectric (monoclinic). If the Zr content is increased, films become ferroelectric (orthorhombic) and then antiferroelectric (tetra…
View article: Unraveling Ferroelectric Polarization and Ionic Contributions to Electroresistance in Epitaxial Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Tunnel Junctions
Unraveling Ferroelectric Polarization and Ionic Contributions to Electroresistance in Epitaxial Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Tunnel Junctions Open
Tunnel devices based on ferroelectric Hf 0.5 Zr 0.5 O 2 (HZO) barriers hold great promises for emerging data storage and computing technologies. The resistance state of the device can be changed through use of a suitable writing voltage. H…
View article: Engineering Ferroelectric Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Thin Films by Epitaxial Stress
Engineering Ferroelectric Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Thin Films by Epitaxial Stress Open
The critical impact of epitaxial stress on the stabilization of the\nferroelectric orthorhombic phase of hafnia is proved. Epitaxial bilayers of\nHf0.5Zr0.5O2 and La0.67Sr0.33MnO3 electrodes were grown on a set of single\ncrystalline oxide…
View article: Epitaxial Integration on Si(001) of Ferroelectric Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Capacitors with High Retention and Endurance
Epitaxial Integration on Si(001) of Ferroelectric Hf<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub> Capacitors with High Retention and Endurance Open
Epitaxial ferroelectric Hf0.5Zr0.5O2 films have been successfully integrated in a capacitor heterostructure on Si(001). The orthorhombic Hf0.5Zr0.5O2 phase, [111] out-of-plane oriented, is stabilized in the films. The films present high re…
View article: Epitaxial ferroelectric thin films on si(001): strain tuning of batio3 and stabilization of polar phase in hf0.5zr0.5o2
Epitaxial ferroelectric thin films on si(001): strain tuning of batio3 and stabilization of polar phase in hf0.5zr0.5o2 Open
Departament responsable de la tesi: Departament de Física.
View article: Control of Polar Orientation and Lattice Strain in Epitaxial BaTiO<sub>3</sub> Films on Silicon
Control of Polar Orientation and Lattice Strain in Epitaxial BaTiO<sub>3</sub> Films on Silicon Open
Conventional strain engineering of epitaxial ferroelectric oxide thin films is based on the selection of substrates with a suitable lattice parameter. Here, we show that the variation of oxygen pressure during pulsed laser deposition is a …
View article: Selectable texture in epitaxial ferroelectric BaTiO<sub>3</sub> films integrated with silicon
Selectable texture in epitaxial ferroelectric BaTiO<sub>3</sub> films integrated with silicon Open
The texture of epitaxial ferroelectric BaTiO3 films on buffered silicon is controlled by selection of the wafer orientation and buffer layers.