16 Result(s)
within
Mirian Garcia-Fernandez
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Article
Open AccessStrain-tuned incompatible magnetic exchange-interaction in La2NiO4
Magnetic frustration is a route for novel ground states, including spin liquids and spin ices. Such frustration can be introduced through either lattice geometry or incompatible exchange interactions. Here, we...
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Open AccessTrapped O2 and the origin of voltage fade in layered Li-rich cathodes
Oxygen redox cathodes, such as Li1.2Ni0.13Co0.13Mn0.54O2, deliver higher energy densities than those based on transition metal redox alone. However, they commonly exhibit voltage fade, a gradually diminishing dis...
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Open AccessWeak signal extraction enabled by deep neural network denoising of diffraction data
The removal or cancellation of noise has wide-spread applications in imaging and acoustics. In applications in everyday life, such as image restoration, denoising may even include generative aspects, which are...
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Open AccessSignature of quantum criticality in cuprates by charge density fluctuations
The universality of the strange metal phase in many quantum materials is often attributed to the presence of a quantum critical point (QCP), a zero-temperature phase transition ruled by quantum fluctuations. I...
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Open AccessChiral phonons in quartz probed by X-rays
The concept of chirality is of great relevance in nature, from chiral molecules such as sugar to parity transformations in particle physics. In condensed matter physics, recent studies have demonstrated chiral...
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Open AccessAuthor Correction: Paramagnons and high-temperature superconductivity in a model family of cuprates
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Open AccessMagnetic excitations beyond the single- and double-magnons
A photon carrying one unit of angular momentum can change the spin angular momentum of a magnetic system with one unit (ΔMs = ±1) at most. This implies that a two-photon scattering process can manipulate the spin...
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Delocalized electron holes on oxygen in a battery cathode
Oxide ions in transition metal oxide cathodes can store charge at high voltage offering a route towards higher energy density batteries. However, upon charging these cathodes, the oxidized oxide ions condense ...
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Critical role of hydrogen for superconductivity in nickelates
The newly discovered nickelate superconductors so far only exist in epitaxial thin films synthesized by a topotactic reaction with metal hydrides1. This method changes the nickelates from the perovskite to an inf...
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Open AccessCorrelation driven near-flat band Stoner excitations in a Kagome magnet
Among condensed matter systems, Mott insulators exhibit diverse properties that emerge from electronic correlations. In itinerant metals, correlations are usually weak, but can also be enhanced via geometrical...
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Charge density waves in infinite-layer NdNiO2 nickelates
In materials science, much effort has been devoted to the reproduction of superconductivity in chemical compositions, analogous to cuprate superconductors since their discovery over 30 years ago. This approach...
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Open AccessParamagnons and high-temperature superconductivity in a model family of cuprates
Cuprate superconductors have the highest critical temperatures (Tc) at ambient pressure, yet a consensus on the superconducting mechanism remains to be established. Finding an empirical parameter that limits the ...
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Open AccessEvolution of spin excitations from bulk to monolayer FeSe
In ultrathin films of FeSe grown on SrTiO3 (FeSe/STO), the superconducting transition temperature Tc is increased by almost an order of magnitude, raising questions on the pairing mechanism. As in other supercond...
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Open AccessCovalency does not suppress O2 formation in 4d and 5d Li-rich O-redox cathodes
Layered Li-rich transition metal oxides undergo O-redox, involving the oxidation of the O2− ions charge compensated by extraction of Li+ ions. Recent results have shown that for 3d transition metal oxides the oxi...
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First-cycle voltage hysteresis in Li-rich 3d cathodes associated with molecular O2 trapped in the bulk
Li-rich cathode materials are potential candidates for next-generation Li-ion batteries. However, they exhibit a large voltage hysteresis on the first charge/discharge cycle, which involves a substantial (up t...
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Coherent many-body exciton in van der Waals antiferromagnet NiPS3
An exciton is the bosonic quasiparticle of electron–hole pairs bound by the Coulomb interaction1. Bose–Einstein condensation of this exciton state has long been the subject of speculation in various model systems
