Marta Gibert
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View article: Engineering the Magnetic Transition Temperatures and the Rare Earth Exchange Interaction in Oxide Heterostructures
Engineering the Magnetic Transition Temperatures and the Rare Earth Exchange Interaction in Oxide Heterostructures Open
The properties of functional oxide heterostructures are strongly influenced by the physics governing their interfaces. Modern deposition techniques allow us to accurately engineer the interface physics through the growth of atomically prec…
Coupling of magnetic phases at nickelate interfaces Open
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, and enabling new strategies for t…
Strain-Tuned Magnetic Frustration in a Square Lattice $J_1$-$J_2$ Material Open
Magnetic frustration is a route that can lead to the emergence of novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either the geometry of lattice structures or by incompatible exchange i…
Metal–insulator transition in composition-tuned nickel oxide films Open
Thin films of the solid solution Nd La NiO 3 are grown in order to study the expected 0 K phase transitions at a specific composition. We experimentally map out the structural, electronic and magnetic properties as a function of x and a di…
View article: Competition between Carrier Injection and Structural Distortions in Electron‐Doped Perovskite Nickelate Thin Films
Competition between Carrier Injection and Structural Distortions in Electron‐Doped Perovskite Nickelate Thin Films Open
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 studies pertain to hole‐doped pe…
View article: Structural and electronic properties of SrCuO2+<i>δ</i> thin films
Structural and electronic properties of SrCuO2+<i>δ</i> thin films Open
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 SrCuO2 infinite-layer compound by in…
Entrainment, diffusion and effective compressibility in a self-similar turbulent jet Open
An experimental Lagrangian study based on particle tracking velocimetry has been completed in an incompressible turbulent round water jet freely spreading into water. The jet is seeded with tracers only through the nozzle: inhomogeneous se…
Top‐Layer Engineering Reshapes Charge Transfer at Polar Oxide Interfaces Open
Charge‐transfer phenomena at heterointerfaces are a promising pathway to engineer functionalities absent in bulk materials but can also lead to degraded properties in ultrathin films. Mitigating such undesired effects with an interlayer re…
View article: Magnetotransport of dirty-limit van Hove singularity quasiparticles
Magnetotransport of dirty-limit van Hove singularity quasiparticles Open
Tuning of electronic density-of-states singularities is a common route to unconventional metal physics. Conceptually, van Hove singularities are realized only in clean two-dimensional systems. Little attention has therefore been given to t…
View article: Ferromagnetic insulating epitaxially strained La$_2$NiMnO$_6$ thin films grown by sputter deposition
Ferromagnetic insulating epitaxially strained La$_2$NiMnO$_6$ thin films grown by sputter deposition Open
The field of oxide spintronics can strongly benefit from the establishment of ferromagnetic insulators with near room-temperature Curie temperature. Here, we investigate the structural, electronic, and magnetic properties of epitaxially st…
Crossover between distinct symmetries in solid solutions of rare earth nickelates Open
A strong coupling of the lattice to functional properties is observed in many transition metal oxide systems, such as the ABO3 perovskites. In the quest for tailor-made materials, it is essential to be able to control the structural proper…
Near-Atomic-Scale Mapping of Electronic Phases in Rare Earth Nickelate Superlattices Open
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 this transition and the possible co…
Length scales of interfacial coupling between metal and insulator phases in oxides Open
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 has been shown to be highly contro…
Vibrational properties of LaNiO3 films in the ultrathin regime Open
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 which dimensionality, strain, an…
View article: Dirty van Hove singularity quasiparticles studied by magnetotransport
Dirty van Hove singularity quasiparticles studied by magnetotransport Open
We present a magnetotransport study of the metamagnetic system Ca$_{1.8}$Sr$_{0.2}$RuO$_4$. The metamagnetic transition is reached by tuning a van Hove singularity to the Fermi level at a critical magnetic field $H_m$. In Ca$_{1.8}$Sr$_{0.…
View article: A laser-ARPES study of LaNiO3 thin films grown by sputter deposition
A laser-ARPES study of LaNiO3 thin films grown by sputter deposition Open
Thin films of the correlated transition-metal oxide LaNiO3 undergo a metal–insulator transition when their thickness is reduced to a few unit cells. Here, we use angle-resolved photoemission spectroscopy to study the evolution of the elect…
Scale-invariant magnetic textures in the strongly correlated oxide NdNiO3 Open
Strongly correlated quantum solids are characterized by an inherently granular electronic fabric, with spatial patterns that can span multiple length scales in proximity to a critical point. Here, we use a resonant magnetic X-ray scatterin…
Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces Open
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 half-integer Bragg peaks, depend upon the total film…
Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces Open
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 half-integer Bragg peaks, depend upon the total film…
Ultrafast Spin Dynamics in Photodoped Spin-Orbit Mott Insulator $Sr_2IrO_4$ Open
Ultrafast photodoping of the Mott insulators, possessing strong correlation between electronic and magnetic degrees of freedom, holds promise for launching an ultrafast dynamics of spins which cannot be described in terms of conventional m…
Strain-engineering Mott-insulating La2CuO4 Open
The transition temperature T c of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La 2−x Sr x CuO 4 thin films, such su…
View article: Light control of the nanoscale phase separation in heteroepitaxial nickelates
Light control of the nanoscale phase separation in heteroepitaxial nickelates Open
Strongly correlated materials show unique solid-state phase transitions with rich nanoscale phenomenology that can be controlled by external stimuli. Particularly interesting is the case of light–matter interaction in the proximity of the …
View article: Engineering the Mott State of Cuprates for High-Temperature Superconductivity.
Engineering the Mott State of Cuprates for High-Temperature Superconductivity. Open
Unconventional superconductivity is often soft and tunable. To optimise $T_c$, the sweet spot for a monolayer of FeSe is, for example, uniquely bound to titanium-oxide substrates. By contrast for La$_{2-x}$Sr$_x$CuO$_4$ thin films, such su…
Rare-earth nickelates<i>R</i>NiO<sub>3</sub>: thin films and heterostructures Open
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 R = La, Pr, Nd, Sm, …, Lu. Nickelates a…
Impact of antiferromagnetism on the optical properties of rare-earth nickelates Open
We study the temperature dependence of the optical conductivity of rare-earth\nnickelate films of varying composition and strain close to the\nantiferromagnetic ordering temperature, TN. Two prominent peaks at 0.6 and 1.3\neV, which are ch…
Erratum: Optical spectroscopy and the nature of the insulating state of rare-earth nickelates [Phys. Rev. B <b>92</b>, 155145 (2015)] Open
3 /NdGaO 3 film-substrate combinations (top two lines) should be *1.5%*(see Ref. [23]) instead of *1.1%*.