Possible Fano resonance for high-T<sub>c</sub> multi-gap superconductivity in p-Terphenyl doped by K at the Lifshitz transition

Mazziotti, Maria Vittoria; Valletta, A.; Campi, Gaetano; Innocenti, Davide; Perali, Andrea; Bianconi, A.

doi:10.1209/0295-5075/118/37003

Cited by 53 publications

(70 citation statements)

References 67 publications

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“…Moreover, they allow us to prevent radiation damage on biological samples providing new key information [70][71][72]. In this work, we present some relevant results showing the relationship between new geometries developing at nano/mesoscale and the emerging macroscopic properties in complex and heterogeneous systems in different fields opening new fundaments in natural sciences [73][74][75][76][77][78][79][80][81][82][83][84].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques

Campi

Bianconi

2019

Condensed Matter

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Out-of-equilibrium phenomena are attracting high interest in physics, materials science, chemistry and life sciences. In this state, the study of structural fluctuations at different length scales in time and space are necessary to achieve significant advances in the understanding of the structure-functionality relationship. The visualization of patterns arising from spatiotemporal fluctuations is nowadays possible thanks to new advances in Xray instrumentation development that combine high-resolution both in space and in time. We present novel experimental approaches using high brilliance synchrotron radiation sources, fast detectors and focusing optics, joint with advanced data analysis based on automated statistical, mathematical and imaging processing tools. This approach has been used to investigate structural fluctuations in out-of-equilibrium systems in the novel field of inhomogeneous quantum complex matter at the crossing point of technology, physics and biology. In particular, we discuss how nanoscale complexity controls the emergence of hightemperature superconductivity (HTS), myelin functionality and formation of hybrid organicinorganic supramolecular assembly. The emergent complex geometries, opening novel venues to quantum technology and to the development of quantum physics of living systems, are discussed.

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Section: Introductionmentioning

confidence: 99%

Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques

Campi

Bianconi

2019

Condensed Matter

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“…Using different procedures of alkali doping it has been recently found that p-Terphenyl K x C 18 H 14 shows a transition from an insulating transparent phase to an inhomogeneous metallic black phase which shows a superconductive behavior with critical temperature T c ranging from few degrees up to 123 Kelvin in different samples [1][2][3][4][5][6][7]. It has been proposed that the amplification of critical temperature reaching a record for metallic aromatic hydrocarbons is driven by the shape resonance belonging to the class for Fano Feshbach resonances in superconducting gaps [8]. It has been proposed that K x C 18 H 14 is a practical realization of a superlattice of quantum wires as described in several patents [9,10] where the critical temperature shows narrow dome if the chemical potential is fine tuned in the proximity of a topological electronic Lifshitz transition [11] in the conduction bands.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Thermal Expansion of p-Terphenyl: a Self-Assembled Supramolecular Array of Poly-p-phenyl Nanoribbons

Barba

Chita

Campi

et al. 2017

J Supercond Nov Magn

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The recent discovery of superconductivity in a metallic aromatic hydrocarbon, alkali-doped p-Terphenyl, has attracted considerable interest. The critical temperature T c ranges from few to 123 K, the record for organic superconductors, due to uncontrolled competition of multiple phases and dopants concentrations. In the proposed mechanism of Fano resonance in a superlattice of quantum wires with coexisting polarons and Fermi particles, the lattice properties play a key role. Here we report a study of the temperature evolution of the parent compound p-Terphenyl crystal structure proposed to be made of a self-assembled supramolecular network of nanoscale nanoribbons. Using temperature dependent synchrotron radiation x-ray diffraction we report the anisotropic thermal expansion in the ab plane, which supports the presence of a nanoscale network of one-dimensional nanoribbons running in the b-axis direction in the P21/a structure. Below the enantiotropic phase transition at 193 K the order parameter of the C-1 structure follows a power law behaviour with the critical exponent α = 0.34±0.02 and the thermal expansion of the a-axis and b-axis show major changes supporting the formation of a two-dimensional bonds network. The large temperature range of the orientation fluctuations in a double well potential of the central phenyl has been determined.

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“…In this regime the Migdal approximation breakdown [76] and it is not possible to apply the BCS theory to explain the emergence of high temperature superconductivity. It has been shown that the emergence of high temperature superconductivity in a multiband scenario near a Lifshitz transition has been described by numerical solution of Bogoliubov equations [77] and can be qualitatively predicted in the limit of a steep -flat scenario [79] where the energy dispersion of the appearing band is pushed down to zero as for the case of an infinite effective mass for strong correlated localized states [78]. An essential point of this proposed scenario for the emergence of room temperature superconductivity is the theoretical demonstration that the Lifshitz transition for the appearing of a strongly correlated band is not of 2,5 order but becomes of first order with appearing of a frustrated phase separation [79], interface superconducting [80] and a hyperbolic space of filamentary pathways in two dimensional systems like it was observed in cuprate perovskite superconductors at optimal doping [81].…”

Section: Figurementioning

confidence: 99%

Fermi-Bose Mixtures and BCS-BEC Crossover in High-Tc Superconductors

Kagan

Bianconi

2019

Condensed Matter

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In this review article we consider theoretically and give experimental support to the models of the Fermi-Bose mixtures and the BCS-BEC crossover compared with the strong-coupling approach, which can serve as the cornerstones on the way from high-temperature to room-temperature superconductivity in pressurized metallic hydrides. We discuss some key theoretical ideas and mechanisms proposed for unconventional superconductors (), superfluids and balanced or imbalanced ultracold Fermi gases in magnetic traps. We build a bridge between unconventional superconductors and recently discovered pressurized hydrides superconductors H3S and LaH10 with the critical temperature close to room temperature. We discuss systems with line of nodal Dirac points close to the Fermi surface and superconducting shape resonances, and hyperbolic superconducting networks which are very important for the development of novel topological superconductors, for the energetics, for the applications in nano-electronics and quantum computations.

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Possible Fano resonance for high-T_c multi-gap superconductivity in p-Terphenyl doped by K at the Lifshitz transition

Abstract: Theories and models of superconducting state PACS 74.10.+v -Occurrence, potential candidates * * * This work has been supported by superstripes-onlus. Discussions with

Cited by 53 publications

References 67 publications

Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques

Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques

Anisotropic Thermal Expansion of p-Terphenyl: a Self-Assembled Supramolecular Array of Poly-p-phenyl Nanoribbons

Fermi-Bose Mixtures and BCS-BEC Crossover in High-Tc Superconductors

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Possible Fano resonance for high-Tc multi-gap superconductivity in p-Terphenyl doped by K at the Lifshitz transition

Abstract: Theories and models of superconducting state PACS 74.10.+v -Occurrence, potential candidates * * * This work has been supported by superstripes-onlus. Discussions with

Cited by 53 publications

References 67 publications

Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques

Evolution of Complexity in Out-of-Equilibrium Systems by Time-Resolved or Space-Resolved Synchrotron Radiation Techniques

Anisotropic Thermal Expansion of p-Terphenyl: a Self-Assembled Supramolecular Array of Poly-p-phenyl Nanoribbons

Fermi-Bose Mixtures and BCS-BEC Crossover in High-Tc Superconductors

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Possible Fano resonance for high-T_c multi-gap superconductivity in p-Terphenyl doped by K at the Lifshitz transition