Nicolas Burdet
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View article: Thermodynamic phase transitions of nematic order in magnetic helices
Thermodynamic phase transitions of nematic order in magnetic helices Open
A nematic phase lacks translation order but has orientational order. Nematic phases have been discovered in a variety of systems, including liquid crystals, correlated materials, and superconductors. Here, we report on a magnetic nematic p…
View article: Magnetically modified double slit based x-ray interferometry
Magnetically modified double slit based x-ray interferometry Open
We demonstrate an experimental approach to determine magneto-optical effects which combines x-ray magnetic circular dichroism (XMCD) with x-ray interferometry, based on the concepts of Young's canonical double slit. By covering one of two …
View article: Understanding the superconductivity and charge density wave interaction through quasi-static lattice fluctuations
Understanding the superconductivity and charge density wave interaction through quasi-static lattice fluctuations Open
In unconventional superconductors, coupled charge and lattice degrees of freedom can manifest in ordered phases of matter that are intertwined. In the cuprate family, fluctuating short-range charge correlations can coalesce into a longer-r…
View article: On ultrafast x-ray scattering methods for magnetism
On ultrafast x-ray scattering methods for magnetism Open
With the introduction of x-ray free electron laser sources around the world, new scientific approaches for visualizing matter at fundamental length and time-scales have become possible. As it relates to magnetism and ‘magnetic-type’ system…
View article: Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La <sub>1.65</sub> Eu <sub>0.2</sub> Sr <sub>0.15</sub> CuO <sub>4</sub>
Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La <sub>1.65</sub> Eu <sub>0.2</sub> Sr <sub>0.15</sub> CuO <sub>4</sub> Open
Understanding 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 …
View article: Testing the data framework for an AI algorithm in preparation for high data rate X-ray facilities
Testing the data framework for an AI algorithm in preparation for high data rate X-ray facilities Open
The advent of next-generation X-ray free electron lasers will be capable of delivering X-rays at a repetition rate approaching 1 MHz continuously. This will require the development of data systems to handle experiments at these type of fac…
View article: Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$
Orbital-selective time-domain signature of nematicity dynamics in the charge-density-wave phase of La$_{1.65}$Eu$_{0.2}$Sr$_{0.15}$CuO$_4$ Open
Understanding 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 …
View article: A machine learning photon detection algorithm for coherent x-ray ultrafast fluctuation analysis
A machine learning photon detection algorithm for coherent x-ray ultrafast fluctuation analysis Open
X-ray free electron laser experiments have brought unique capabilities and opened new directions in research, such as creating new states of matter or directly measuring atomic motion. One such area is the ability to use finely spaced sets…
View article: A machine learning photon detection algorithm for coherent X-ray ultrafast fluctuation analysis
A machine learning photon detection algorithm for coherent X-ray ultrafast fluctuation analysis Open
X-ray free electron laser (XFEL) experiments have brought unique capabilities and opened new directions in research, such as creating new states of matter or directly measuring atomic motion. One such area is the ability to use finely spac…
View article: Simulated X-ray Photon Fluctuation Spectroscopy Dataset
Simulated X-ray Photon Fluctuation Spectroscopy Dataset Open
Dataset for simulated X-ray Photon Fluctuation Spectroscopy (XPFS) detector images and photon maps. XPFS is a X-ray speckle imaging technique used at SLAC National Accelerator Laboratory to study ultrafast materials dynamics.
View article: Simulated X-ray Photon Fluctuation Spectroscopy Dataset
Simulated X-ray Photon Fluctuation Spectroscopy Dataset Open
Dataset for simulated X-ray Photon Fluctuation Spectroscopy (XPFS) detector images and photon maps. XPFS is a X-ray speckle imaging technique used at SLAC National Accelerator Laboratory to study ultrafast materials dynamics.
View article: Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model
Absolute contrast estimation for soft X-ray photon fluctuation spectroscopy using a variational droplet model Open
X-ray photon fluctuation spectroscopy (XPFS) using a two-pulse mode at the Linac Coherent Light Source has great potential for the study of quantum fluctuations in materials as it allows for exploration of low-energy physics. However, the …
View article: X-ray ptychography on low-dimensional hard-condensed matter materials
X-ray ptychography on low-dimensional hard-condensed matter materials Open
Tailoring structural, chemical, and electronic (dis-)order in heterogeneous media is one of the transformative opportunities to enable new functionalities and sciences in energy and quantum materials. This endeavor requires elemental, chem…
View article: Multi-Modal Ptychography: Recent Developments and Applications
Multi-Modal Ptychography: Recent Developments and Applications Open
Utilisation of partially coherent X-rays in Coherent X-ray Diffraction Imaging (CDI) and X-ray ptychography have brought intense research and developments for the past few years. Generally, data reconstructions convergence can be achieved …
View article: Frontispiece: Visualization of Heterogeneous Oxygen Storage Behavior in Platinum‐Supported Cerium‐Zirconium Oxide Three‐Way Catalyst Particles by Hard X‐ray Spectro‐Ptychography
Frontispiece: Visualization of Heterogeneous Oxygen Storage Behavior in Platinum‐Supported Cerium‐Zirconium Oxide Three‐Way Catalyst Particles by Hard X‐ray Spectro‐Ptychography Open
Oxygen Storage Hard X-ray spectro-ptychography (ptychographic-XAFS) is used by Y. Takahashi et al. in their Communication on page 1474 to visualize cerium density and valence of platinum-supported ceria-zirconia oxide Pt/Ce2Zr2Ox catalyst …
View article: Bragg projection ptychography on niobium phase domains
Bragg projection ptychography on niobium phase domains Open
We demonstrate that the highly sensitive phase-contrast properties of Bragg\ncoherent diffraction measurements combined with the translational diversity of\nptychography can provide a Bragg "dark field" imaging method capable of\nrevealing…
View article: Use of Kramers–Kronig relation in phase retrieval calculation in X-ray spectro-ptychography
Use of Kramers–Kronig relation in phase retrieval calculation in X-ray spectro-ptychography Open
Coherent diffraction imaging (CDI) is a method for reconstructing the complex-valued image of an object from diffraction intensities by using iterative phasing methods. X-ray ptychography is a scanning type of CDI using X-rays, allowing us…
View article: Dark-field X-ray ptychography: Towards high-resolution imaging of thick and unstained biological specimens
Dark-field X-ray ptychography: Towards high-resolution imaging of thick and unstained biological specimens Open
View article: Multiple defocused coherent diffraction imaging: method for simultaneously reconstructing objects and probe using X-ray free-electron lasers
Multiple defocused coherent diffraction imaging: method for simultaneously reconstructing objects and probe using X-ray free-electron lasers Open
The sample size must be less than the diffraction-limited focal spot size of the incident beam in single-shot coherent X-ray diffraction imaging (CXDI) based on a diffract-before-destruction scheme using X-ray free electron lasers (XFELs).…
View article: Efficient use of coherent X-rays in ptychography: Towards high-resolution and high-throughput observation of weak-phase objects
Efficient use of coherent X-rays in ptychography: Towards high-resolution and high-throughput observation of weak-phase objects Open
The efficient use of coherent X-rays is a crucial issue for ptychography at synchrotron facilities. We propose a method for optimizing the population of coherent modes for an optimal resolution. We show by a wave optical simulation that th…
View article: Evaluation of partial coherence correction in X-ray ptychography
Evaluation of partial coherence correction in X-ray ptychography Open
Coherent X-ray Diffraction Imaging (CDI) and X-ray ptychography both heavily rely on the high degree of spatial coherence of the X-ray illumination for sufficient experimental data quality for reconstruction convergence. Nevertheless, the …