Papers by Alessandro Ricci
Physical Review B, 2015
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Advances in Condensed Matter Physics, 2010
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Physical Review B, 2013
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Scientific Reports, 2013
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Applied Physics Letters, 2014
The simplest cuprate superconductor La2CuO4+y with mobile oxygen interstitials exhibits a clear p... more The simplest cuprate superconductor La2CuO4+y with mobile oxygen interstitials exhibits a clear phase separation. It is known that oxygen interstitials enter into the rocksalt La2O2+y spacer layers forming oxygen interstitials rich puddles and poor puddles but only recently a bulk multiscale structural phase separation has been observed by using scanning micro X-ray diffraction. Here we get further information on their spatial distribution, using scanning La L3-edge micro X-ray absorption near edge structure. Percolating networks of oxygen rich puddles are observed in different micrometer size portions of the crystals. Moreover, the complex surface resistivity shows two jumps associated to the onset of intra-puddle and inter-puddles percolative superconductivity. The similarity of oxygen doped La2CuO4+y, with the well established phase separation in iron selenide superconductors is also discussed.
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Scientific reports, Jan 25, 2014
Degradation of the myelin sheath is a common pathology underlying demyelinating neurological dise... more Degradation of the myelin sheath is a common pathology underlying demyelinating neurological diseases from Multiple Sclerosis to Leukodistrophies. Although large malformations of myelin ultrastructure in the advanced stages of Wallerian degradation is known, its subtle structural variations at early stages of demyelination remains poorly characterized. This is partly due to the lack of suitable and non-invasive experimental probes possessing sufficient resolution to detect the degradation. Here we report the feasibility of the application of an innovative non-invasive local structure experimental approach for imaging the changes of statistical structural fluctuations in the first stage of myelin degeneration. Scanning micro X-ray diffraction, using advances in synchrotron x-ray beam focusing, fast data collection, paired with spatial statistical analysis, has been used to unveil temporal changes in the myelin structure of dissected nerves following extraction of the Xenopus laevis s...
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Superconductor Science and Technology, 2010
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Superconductor Science and Technology, 2008
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Superconductor Science and Technology, 2010
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Superconductor Science and Technology, 2011
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Proceedings of the National Academy of Sciences, 2012
Electronic functionalities in materials from silicon to transition metal oxides are, to a large e... more Electronic functionalities in materials from silicon to transition metal oxides are, to a large extent, controlled by defects and their relative arrangement. Outstanding examples are the oxides of copper, where defect order is correlated with their high superconducting transition temperatures. The oxygen defect order can be highly inhomogeneous, even in optimal superconducting samples, which raises the question of the nature of the sample regions where the order does not exist but which nonetheless form the “glue” binding the ordered regions together. Here we use scanning X-ray microdiffraction (with a beam 300 nm in diameter) to show that for La 2 CuO 4+ y , the glue regions contain incommensurate modulated local lattice distortions, whose spatial extent is most pronounced for the best superconducting samples. For an underdoped single crystal with mobile oxygen interstitials in the spacer La 2 O 2+ y layers intercalated between the CuO 2 layers, the incommensurate modulated local l...
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Physical Review B, 2010
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Physical Review B, 2011
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Physical Review B, 2010
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Physical Review B, 2011
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New Journal of Physics, 2014
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Nature Materials, 2011
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Papers by Alessandro Ricci