316 citations · 2k across the 36 of their papers we have counts for
28 papers · 1 filter
Intermittent dynamics of antiferromagnetic phase in inhomogeneous iron-based chalcogenide superconductor
A. Ricci, G. Campi, B. Joseph +9
Coexistence of phases, characterized by different electronic degrees of freedom, commonly occurs in layered superconductors. Among them, alkaline intercalated chalcogenides are mod…
X-rays writing/reading of Charge Density Waves in the CuO2 plane of a simple cuprate superconductor
Gaetano Campi, Alessandro Ricci, Nicola Poccia +2
It is now well established that superconductivity in cuprates competes with charge modulations giving electronic phase separation at a nanoscale. More specifically, superconducting…
Dislocations as a boundary between charge density wave and oxygen rich phases in a cuprate high temperature superconductor
Nicola Poccia, Alessandro Ricci, Gaetano Campi +1
Multiple functional ionic and electronic orders are observed in high temperature superconducting cuprates. The charge density wave order is one of them and it is spatially localize…
Lattice, Charge and Spin phase inhomogeneity in complex striped quantum matter
Antonio Bianconi, Alessandro Ricci
The Superstripes 2016 conference, held on June 23-29, 2016 in the island of Ischia in Italy celebrated the 20th anniversary of this series of conferences. For 20 years structural,…
2D nano-granularity of the oxygen chains in the YBa2Cu3O6.33 superconductor
G. Campi, A. Ricci, N. Poccia +1
The organization of dopants in high temperature superconductors provides complex topological geometries that controls superconducting properties. This makes the study of dopants sp…
Temperature dependent As K-edge EXAFS studies of LaFe1-xCoxAsO (x = 0.0 and 0.11) single crystals
Boby Joseph, Alessandro Ricci, Nicola Poccia +5
We report the experimental results of temperature dependent polarized As K-edge extended x-ray absorption fine structure (EXAFS) of LaFe1-xCoxAsO (x=0.0 and 0.11) single-crystals.…
The flux dynamics behavior of the two competing high temperature superconducting phases in underdoped LaCuO4.06
D. Di Gioacchino, A. Puri, A. Marcelli +3
In complex transition metal oxides (TMO) an arrested electronic phase separation (PS) appears by tuning the system near a Lifshitz transition in multiband Hubbard models. The PS in…
Inhomogeneity of charge density wave order and quenched disorder in a high Tc superconductor
G. Campi, A. Bianconi, N. Poccia +11
It has recently been established that the high temperature (high-Tc) superconducting state coexists with short-range charge-density-wave order and quenched disorder arising from do…
Networks of superconducting nano-puddles in 1/8 doped YBa2Cu3O6.5+y controlled by thermal manipulation
Alessandro Ricci, Nicola Poccia, Gaetano Campi +8
While it is known that the nature and the arrangement of defects in complex oxides have an impact on the material functionalities little is known on control of superconductivity by…
Multiscale distribution of oxygen puddles in 1/8 doped YBa2Cu3O6.67
Alessandro Ricci, Nicola Poccia, Gaetano Campi +6
Despite intensive research a physical explanation of high Tc superconductors remains elusive. One reason for this is that these materials have generally a very complex structure ma…
Percolative superconductivity in La2CuO4.06 by lattice granularity patterns with scanning micro X-ray absorption near edge structure
Nicola Poccia, Matthieu Chorro, Alessandro Ricci +4
The simplest cuprate superconductor La2CuO4+y with mobile oxygen interstitials exhibits a clear phase separation, but only recently a bulk multiscale structural phase separation ha…
Scanning micro X-ray diffraction unveils the distribution of oxygen chains nano-puddles in YBa2Cu3O6.33
Gaetano Campi, Alessandro Ricci, Nicola Poccia +5
Oxygen chain fragments are known to appear at the insulator to superconductor transition (SIT) in YBa2Cu3O6+y. However the self organization and the size distribution of oxygen cha…
Competing striped structures in La2CuO4+y
Nicola Poccia, Alessandro Ricci, Gaetano Campi +2
High temperature superconductivity emerges in unique materials, like cuprates, that belong to the class of heterostructures at atomic limit, made of a superlattice of superconducti…
Optimum inhomogeneity of local lattice distortions in La2CuO4+y
Nicola Poccia, Alessandro Ricci, Gaetano Campi +9
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…
Nanoscale phase separation in the iron chalcogenide superconductor K0.8Fe1.6Se2 as seen via scanning nanofocused x-ray diffraction
A. Ricci, N. Poccia, G. Campi +11
Advanced synchrotron radiation focusing down to a size of 300 nm has been used to visualize nanoscale phase separation in the K0.8Fe1.6Se2 superconducting system using scanning nan…
Spatial inhomogeneity and chiral symmetry of the lattice incommensurate supermodulation in high temperature superconductor Bi2Sr2CaCu2O8+y
Nicola Poccia, Gaetano Campi, Michela Fratini +3
Using scanning micro X-ray diffraction we report a mixed real and reciprocal space visualization of the spatial heterogeneity of the lattice incommensurate supermodulation in singl…
Evolution and Control of Oxygen Order in a Cuprate Superconductor
Nicola Poccia, Michela Fratini, Alessandro Ricci +6
The disposition of defects in metal oxides is a key attribute exploited for applications from fuel cells and catalysts to superconducting devices and memristors. The most typical d…
Intrinsic phase separation in superconducting K0.8Fe1.6Se2 (Tc= 31.8 K) single crystals
Alessandro Ricci, Nicola Poccia, Boby Joseph +9
Temperature dependent single-crystal x-ray diffraction (XRD) in transmission mode probing the bulk of the newly discovered K0.8Fe1.6Se2 superconductor (Tc = 31.8 K) using synchrotr…
Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers
Davide Innocenti, Sergio Caprara, Nicola Poccia +3
The multigap superconductivity modulated by quantum confinement effects in a superlattice of quantum wells is presented. Our theoretical BCS approach captures the low-energy physic…
Scale-free structural organization of oxygen interstitials in La2CuO4+y
Michela Fratini, Nicola Poccia, Alessandro Ricci +4
It is well known that the microstructures of the transition-metal oxides (refs 1-3), including the high-transition-temperature (high-Tc) copper oxide superconductors (refs 4-7), ar…
Structural phase transition and superlattice misfit strain of RFeAsO (R = La, Pr, Nd and Sm)
Alessandro Ricci, Nicola Poccia, B. Joseph +9
The tetragonal-to-orthorhombic structural phase transition (SPT) in LaFeAsO (La-1111) and SmFeAsO (Sm-1111) single crystals measured by high resolution x-ray diffraction is found t…
Resonant and crossover phenomena in a multiband superconductor tuning the chemical potential near a band edge
Davide Innocenti, Nicola Poccia, Alessandro Ricci +4
Resonances in the superconducting properties, in a regime of crossover from BCS to mixed Bose-Fermi superconductivity, are investigated in a two-band superconductor where the chemi…
A model for liquid-striped liquid phase separation in liquids of anisotropic polarons
D. Innocenti, A. Ricci, N. Poccia +3
The phase separation between a striped polaron liquid at the particular density and a high density polaron liquid is described by a modified Van der Waals scheme. The striped polar…
Flux dynamics in NdO1-xFxFeAs bulk sample
D. Di Gioacchino, A. Marcelli, S. Zhang +4
We present data of multi harmonic magneto-dynamic experiments. In particular, we performed ac magnetic susceptibility experiments on layered pnictide-oxide quaternary compound NdOF…