Abstract
Superlattices of Relativistic Oxides. The project aims to investigate and control the physical properties of relativistic Mott insulators—a class of transition-metal oxides (specifically iridates) characterized by strong spin-orbit coupling and electronic correlation. Focusing on the Ruddlesden-Popper Srₙ₊₁IrₙO₃ₙ₊₁ iridate series, the goal is to explore and synthesize previously inaccessible intermediate phases (n > 2) using artificial superlattices. The project combines experimental and theoretical approaches to understand the interplay of spin, charge, orbital, and lattice degrees of freedom. It also aims to achieve electrical control of transport and magnetic properties through strain engineering and ferroelectric interfaces, with potential applications in oxide spintronics. Additionally, the project seeks to establish a sustainable and international research team with expertise across condensed matter physics. Epitaxial Growth of Ruddlesden-Popper (RP) Iridate Thin Films and Superlattices -Successful fabrication of high-quality RP iridate thin films and superlattices with precise stoichiometry and atomic-layer control. -Computational prediction of stable structures for large-n RP iridates using DFT+U+SOC simulations. -Generation of simulated STEM images and structural data to guide synthesis. -Optimization of growth conditions (via PLD), confirmed through XPS, XRD, LEED/RHEED, and STEM characterizations. 2. Understanding Physical Properties through Experiment and Theory -Detailed experimental characterization of transport (e.g., magnetoresistance) and magnetic properties using MOKE, VSM, XMCD, and XRMS. -In-depth study of electronic and magnetic interactions using XAS, ARPES, and RIXS to reveal orbital character, excitations, and coupling mechanisms. -Theoretical modeling of ground states and excitations using DFT+U+SOC, GW+BSE, and DMFT, enabling direct comparison with experimental data. -Implementation of a new MOKE simulation module for theoretical-experimental benchmarking. 3. Design of Iridate/Ferroelectric Superlattices with Magnetoelectric Properties -Fabrication of novel superlattices combining RP iridates with ferroelectrics (e.g., PZT), aiming to realize magnetoelectric phases. -Identification of interfacial effects such as strain-induced distortions and their impact on magnetic and transport behavior. -Theoretical guidance to tailor combinations for desired functionalities relevant to oxide spintronics applications. Broader Outcomes: -Publications in high-impact, open-access journals -Presentations at international/national conferences -Hosting an international workshop to foster collaboration and future directions
Project details
Unibo Team Leader: Cesare Franchini
Unibo involved Department/s:
Dipartimento di Fisica e Astronomia "Augusto Righi"
Coordinator:
Politecnico di MILANO(Italy)
Total Unibo Contribution: Euro (EUR) 65.199,00
Project Duration in months: 24
Start Date:
28/09/2023
End Date:
27/09/2025
