Publications by authors named "R Sutarto"
The term sample dependence describes the troublesome tendency of nominally equivalent samples to exhibit different physical properties. High entropy oxides (HEOs) are a class of materials where sample dependence has the potential to be particularly profound due to their inherent chemical complexity. In this work, we prepare a spinel HEO of identical nominal composition by five distinct methods, spanning a range of thermodynamic and kinetic conditions: solid state, high pressure, hydrothermal, molten salt, and combustion syntheses.
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- The study explores the behavior of rare earth nickelates (RENiO) during a phase transition from metal to insulator, focusing on how electron-lattice interactions lead to bond disproportionation and spin order among nickel and ligand spins.
- Researchers investigated a hypothesis that self-doped ligand holes create local spin moments that couple antiferromagnetically with Ni spins, leading to long-range bond and spin order, specifically in NdNiO thin films.
- Using magnetic resonant X-ray scattering, the study found spiral spin patterns in the material that show an unexpected chiral magnetic configuration, hinting at a possible link between this noncollinear magnetic state and unusual ferroelectric characteristics.
Strongly correlated materials respond sensitively to external perturbations such as strain, pressure, and doping. In the recently discovered superconducting infinite-layer nickelates, the superconducting transition temperature can be enhanced via only ~ 1% compressive strain-tuning with the root of such enhancement still being elusive. Using resonant inelastic x-ray scattering (RIXS), we investigate the magnetic excitations in infinite-layer PrNiO thin films grown on two different substrates, namely SrTiO (STO) and (LaAlO)(SrTaAlO) (LSAT) enforcing different strain on the nickelates films.
View Article and Find Full Text PDFUnderstanding the interplay between charge, nematic, and structural ordering tendencies in cuprate superconductors is critical to unraveling their complex phase diagram. Using pump-probe time-resolved resonant X-ray scattering on the (0 0 1) Bragg peak at the Cu [Formula: see text] and O [Formula: see text] resonances, we investigate nonequilibrium dynamics of [Formula: see text] nematic order and its association with both charge density wave (CDW) order and lattice dynamics in La[Formula: see text]Eu[Formula: see text]Sr[Formula: see text]CuO[Formula: see text]. The orbital selectivity of the resonant X-ray scattering cross-section allows nematicity dynamics associated with the planar O 2[Formula: see text] and Cu 3[Formula: see text] states to be distinguished from the response of anisotropic lattice distortions.
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