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Publications highlights

Electron-Beam Writing of Atomic-Scale Reconstructions at Oxide Interfaces

Accepted in Nanoletters

The epitaxial growth of complex oxides enables the production of high-quality films, yet substrate choice is restricted to certain symmetry and lattice parameters, thereby limiting the technological...

Role of the coupling of the electronic transitions on the order of the metal-to-insulator phase transition in nickelates

APL Mater. 12, 081120 (2024)

Rare-earth nickelates (chemical formula RNiO3, R being a rare-earth cation) display a temperature-dependent metal-to-insulator transition (MIT) together with a breathing distortion of the...

Mapping orthorhombic domains with geometrical phase analysis in rare-earth nickelate heterostructures

Mundet et al. – APL Mater. 12, 031124 (2024)

Most perovskite oxides belong to the Pbnm space group, composed of an anisotropic unit cell, A-site antipolar displacements, and oxygen octahedral tilts. Mapping the orientation of the orthorhombic unit cell...

Structural study of nickelate based heterostructures

Varbaro et al. – APL Mater. 12, 031104 (2024)

Heterostructures consisting of SmNiO3 and NdNiO3 alternating layers with additional LaAlO3 spacer layers were grown and fully characterized by means of x-ray diffraction,...

Observation of the orbital inverse Rashba–Edelstein effect

El Hamdi  et al. – Nat. Phys. (2023).

The spin–orbit interaction plays an important role in magnetism and in many quantum materials. It is the cornerstone of the physics of many electronic phases that emerge at interfaces because of broken...

Coupling of magnetic phases at nickelate interfaces

Domínguez et al. – Physical Review Materials 7, 065002 (2023)

In this paper we present a model system built out of artificially layered materials, allowing us to understand the interrelation of magnetic phases with the metallic-insulating phase at long length scales,...

Mapping the complex evolution of ferroelastic/ferroelectric domain patterns in epitaxially strained PbTiO3 heterostructures

Lichtensteiger et al. – APL Mater 11, 061126 (2023)

We study the complex ferroelastic/ferroelectric domain structure in the prototypical ferroelectric PbTiO3 epitaxially strained on (110)o-oriented DyScO3 substrates, using a...

Electronic Coupling of Metal-to-Insulator Transitions in Nickelate-Based Heterostructures

Varbaro et al. – Adv. Electron.Mater.2023, 2201291

In rare earth nickelates, the metal-to-insulator transition observed as a function of temperature can be described using an electronic and a structural order parameter. The electronic one is linked to the...

Oxygen isotope effect in VO2

Rischau et al. – Phys. Rev. B 107, 115139

We investigate the oxygen isotope effect on the VO2 metal-insulator transition. Using an alternative method, we synthesize V16O2 and V18O2 crystals,...

Competition between Carrier Injection and Structural Distortions in Electron-Doped Perovskite Nickelate Thin Films

Hadjimichael et al. – Adv. Electron.Mater.2023, 2201182

The discovery of superconductivity in doped infinite-layer nickelate thin films has brought increased attention to the behavior of the doped perovskite phase. Despite this interest, the majority of existing...

Structural and electronic properties of SrCuO2+δ thin films

APL Materials 10, 101112 (2022)

The layered structure of superconducting cuprates is considered to be a key ingredient to achieve high superconducting transition temperatures. In this work, we investigate the possibility of doping the...

Generation of Tunable Stochastic Sequences Using the Insulator–Metal Transition

Nano Lett. 2022, 22, 3, 1251–1256
Probabilistic computing is a paradigm in which data are not represented by stable bits, but rather by the probability of a metastable bit to be in a particular state. The development of this technology has...

Designing and controlling the properties of transition metal oxide quantum materials

Nature Materials volume 20, pages 1462–1468 (2021)

This Perspective addresses the design, creation, characterization and control of synthetic quantum materials with strong electronic correlations. We show how emerging synergies between...

Near-Atomic-Scale Mapping of Electronic Phases in Rare Earth Nickelate Superlattices

Nano Lett. 2021, 21, 6, 2436–2443

Nanoscale mapping of the distinct electronic phases characterizing the metal–insulator transition displayed by most of the rare-earth nickelate compounds is fundamental for discovering the true nature of...

Length scales of interfacial coupling between metal and insulator phases in oxides

Nature Materials volume 19, pages 1182–1187 (2020)

Controlling phase transitions in transition metal oxides remains a central feature of both technological and fundamental scientific relevance. A well-known example is the metal–insulator transition, which...

Vibrational properties of LaNiO3 films in the ultrathin regime

APL Materials 8, 061102 (2020)

Collective rotations and tilts of oxygen polyhedra play a crucial role in the physical properties of complex oxides such as magnetism and conductivity. Such rotations can be tuned by preparing thin films in...

High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces

Nature Communications volume 10, 2774 (2019)

Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad...

Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces

Nano Lett. 2019, 19, 6, 4188–4194

In this study, we analyze how the octahedral tilts and rotations of thin films of LaNiO3 and LaAlO3 grown on different substrates, determined using synchrotron X-ray diffraction-measured ...

A spin-orbit playground: surfaces and interfaces of transition metal oxides

Reports on Progress in Physics 82, 012501 (2018)

Within the last twenty years, the status of the spin–orbit interaction has evolved from that of a simple atomic contribution to a key effect that modifies the electronic band structure of materials. It is...

Rare-earth nickelates RNiO3: thin films and heterostructures

Reports on Progress in Physics. 2018, vol. 81, no. 046501

This review stands in the larger framework of functional materials by focussing on heterostructures of rare-earth nickelates, described by the chemical formula RNiO3 where R is a trivalent rare-earth...

Structural analysis of LaVO3 thin films under epitaxial strain

APL Materials 6, 046102 (2018)

Rare earth vanadate perovskites exhibit a phase diagram in which two different types of structural distortions coexist: the strongest, the rotation of the oxygen octahedra, comes from the small tolerance...

Ferroelectricity woos pairing

Nature Physics volume 13, pages 624–625 (2017)

Can ferroelectricity and superconductivity occur simultaneously? Can ferroelectricity boost the superconducting critical temperature? Writing in Nature Physics, Carl Rischau and colleagues1 report...

Conductivity and Local Structure of LaNiO3 Thin Films

Advanced materials. 2017, vol. 29, no. 18, 1605197

A marked conductivity enhancement is reported in 6–11 unit cell LaNiO3 thin films. A maximal conductivity is also observed in ab initio calculations for films of the same thickness. In agreement with...

Efficient spin-to-charge conversion in the 2D electron liquid at the LAO/STO interface

Europhysics Letters, Volume 116, Number 1

Spin-to-charge conversion using the inverse Rashba-Edelstein effect is measured in the 2D electron liquid existing at the interface between LaAlO3 and SrTiO3. The effect is found to be...

Ferroelectric domains in epitaxial PbxSr1−xTiO3 thin films investigated using X-ray diffraction and piezoresponse force microscopy

APL Materials. 2016, vol. 4, no. 8, 086105

We present a detailed study of compressively strained PbxSr1−xTiO3 thin films grown by off-axis radio frequency magnetron sputtering on (001)-oriented Nb-doped...

Negative capacitance in multidomain ferroelectric superlattices

Nature volume 534, pages 524–528 (2016)

The stability of spontaneous electrical polarization in ferroelectrics is fundamental to many of their current applications, which range from the simple electric cigarette lighter to non-volatile random...

Built-in voltage in thin ferroelectric PbTiO3 films: the effect of electrostatic boundary conditions

New Journal of Physics, Volume 18, April 2016

We have studied the built-in voltage in heterostructures composed of ferroelectric PbTiO3 and dielectric spacers of SrTiO3, grown on SrTiO3 substrates with SrRuO3...

Interlayer coupling through a dimensionality-induced magnetic state

Nature Communications volume 7, 11227 (2016)

Dimensionality is known to play an important role in many compounds for which ultrathin layers can behave very differently from the bulk. This is especially true for the paramagnetic metal LaNiO3,...

Research Update: Conductivity and beyond at the LaAlO3/SrTiO3 interface

APL Materials 4, 060701 (2016)

In this review, we focus on the celebrated interface between two band insulators, LaAlO3 and SrTiO3, that was found to be conducting, superconducting, and to display a strong spin-orbit coupling. We discuss...

Characterization of atomic force microscopy written conducting nanowires at LaAlO3/SrTiO3 interfaces

Appl. Phys. Lett. 108, 061604 (2016)

The realization of conducting nanostructures at the interface between LaAlO3 and SrTiO3 is an important step towards the realization of devices and the investigation of exotic physical regimes. We present...

Positive Effect of an Internal Depolarization Field in Ultrathin Epitaxial Ferroelectric Films

Adv. Electron.Mater.2016, 2, 1500288

The effect of intentionally introducing a large depolarization field in (001)-oriented, epitaxial Pb(Zr0.2TiO0.8)O3 (PZT) ultrathin films grown on...

Interfacial Control of Magnetic Properties at LaMnO3/LaNiO3 Interfaces

Nano Lett. 2015, 15, 11, 7355–7361

The functional properties of oxide heterostructures ultimately rely on how the electronic and structural mismatches occurring at interfaces are accommodated by the chosen materials combination. We discuss...

Spatially resolved ultrafast magnetic dynamics initiated at a complex oxide heterointerface

Nature Mater 14, 883–888 (2015)

Static strain in complex oxide heterostructures has been extensively used to engineer electronic and magnetic properties at equilibrium. In the same spirit, deformations of the crystal lattice with light may...

Giant oscillating thermopower at oxide interfaces

Nature Communications volume 6, 6678 (2015)

Understanding the nature of charge carriers at the LaAlO3/SrTiO3 interface is one of the major open issues in the full comprehension of the charge confinement phenomenon in oxide...

Tailoring the electronic transitions of NdNiO3 films through (111)pc oriented interfaces

APL Materials 3, 062506 (2015)

Bulk NdNiO3 and thin films grown along the pseudocubic (001)pc axis display a 1st order metal to insulator transition (MIT) together with a Néel transition at T = 200 K. Here, we show...

Tuning of the Depolarization Field and Nanodomain Structure in Ferroelectric Thin Films

Nano Lett. 2014, 14, 8, 4205–4211

The screening efficiency of a metal–ferroelectric interface plays a critical role in determining the polarization stability and hence the functional properties of ferroelectric thin films. Imperfect...

Fabricating superconducting interfaces between artificially grown LaAlO3 and SrTiO3 thin films

APL Materials 2, 012102 (2014)

Realization of a fully metallic two-dimensional electron gas (2DEG) at the interface between artificially grown LaAlO3 and SrTiO3 thin films has been an excitingchallenge. Here we present for the first time...

Tunable conductivity threshold at polar oxide interfaces

Nature Communications volume 3, 932 (2012)

The physical mechanisms responsible for the formation of a two-dimensional electron gas at the interface between insulating SrTiO3 and LaAlO3 have remained a contentious subject since...

Electrostatic Coupling and Local Structural Distortions at Interfaces in Ferroelectric/Paraelectric Superlattices

Nano Lett. 2012, 12, 6, 2846–2851

The performance of ferroelectric devices is intimately entwined with the structure and dynamics of ferroelectric domains. In ultrathin ferroelectrics, ordered nanodomains arise naturally in response to the...

Exchange bias in LaNiO3–LaMnO3 superlattices

Nature Materials volume 11, 195–198 (2012)

The wide spectrum of exotic properties exhibited by transition-metal oxides stems from the complex competition between several quantum interactions. The capacity to select the emergence of specific phases at...

Interface Physics in Complex Oxide Heterostructures

Annual Review of Condensed Matter Physics. 2011, vol. 2, no. 1, p. 141-165

Complex transition metal oxides span a wide range of crystalline structures and play host to an incredible variety of physical phenomena. High dielectric permittivities, piezo-, pyro-, and ferroelectricity...

Electric field control of the LaAlO3/SrTiO3 interface ground state

Nature volume 456, pages 624–627 (2008)

Interfaces between complex oxides are emerging as one of the most interesting systems in condensed matter physics. In this special setting, in which translational symmetry is artificially broken, a variety of ...

Improper ferroelectricity in perovskite oxide artificial superlattices

Nature. 2008, vol. 452, no. 7188, p. 732-736

Ferroelectric thin films and superlattices are currently the subject of intensive research because of the interest they raise for technological applications and also because their properties are of...

Superconducting Interfaces Between Insulating Oxides

Science. 2007, vol. 317, no. 5842, p. 1196-1199

At interfaces between complex oxides, electronic systems with unusual electronic properties can be generated. We report on superconductivity in the electron gas formed at the interface between two insulating...