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Drosophila of phonon-mediated superconductivity: Full Eliashberg theory of the jellium model
Christophe Berthod, Louk Rademaker, Dirk van der Marel
We present a full numerical solution of the Migdal--Eliashberg equations for the jellium model of phonon-mediated superconductivity. We find very low critical temperatures below 1~…
Superconductivity in metallic hydrogen
Dirk van der Marel, Christophe Berthod
Superconductivity, the lossless flow of electric current, occurs typically at very low temperatures. A possible exception is highly pressurized hydrogen, for which room temperature…
Vortex-core spectroscopy of -wave cuprate high-temperature superconductors
Ivan Maggio-Aprile, Tejas Parasram Singar, Christophe Berthod +3
The mechanism of high-temperature superconductivity remains one of the great challenges of contemporary physics. Here, we review efforts to image the vortex lattice in copper oxide…
Can dd excitations mediate pairing ?
Francesco Barantani, Christophe Berthod, Dirk van der Marel
The Cu- states in the high- cuprates are often described as a single band of states, with the other four states having about 2 to 3 eV higher energy du…
Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states
Khalil Zakeri, Dominik Rau, Jasmin Jandke +3
In condensed-matter physics spin-orbit coupling (SOC) is a fundamental physical interaction, which describes how the electrons' spin couples to their orbital motion. It is the sour…
Resonant Inelastic X-ray Scattering Study of Electron-Exciton Coupling in High-Tc Cuprates
F. Barantani, M. K. Tran, I. Madan +14
Explaining the mechanism of superconductivity in the high- cuprates requires an understanding of what causes electrons to form Cooper pairs. Pairing can be mediated by phonons…
Periodicity of superconducting shape resonances in thin films
D. Valentinis, C. Berthod
The pairing temperature of superconducting thin films is expected to display, within the Bardeen-Cooper-Schrieffer theory, oscillations as a function of the film thickness. We show…
Modulation of superconductivity by quantum confinement in doped strontium titanate
Davide Valentinis, Zhenping Wu, Stefano Gariglio +6
Quantum confinement in a thin-film geometry offers viable routes for tuning the critical properties of superconductors through modification of both density of states and pairing in…
Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of FeTeSe
Christophe Berthod
Scanning tunneling experiments on single crystals of superconducting FeTeSe have recently provided evidence for discrete energy levels inside vortices. Although p…
Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2
J. A. Galvis, E. Herrera, C. Berthod +3
Superconducting vortex cores have been extensively studied for magnetic fields applied perpendicular to the surface by mapping the density of states (DOS) through Scanning Tunnelin…
Observation of Caroli-de Gennes-Matricon Vortex States in YBaCuO
Christophe Berthod, Ivan Maggio-Aprile, Jens Bruér +2
The copper oxides present the highest superconducting temperature and properties at odds with other compounds, suggestive of a fundamentally different superconductivity. In particu…
Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO/SrTiO interface
D. Valentinis, S. Gariglio, A. Fête +3
Superconductivity develops in bulk doped SrTiO and at the LaAlO/SrTiO interface with a dome-shaped density dependence of the critical temperature , despite differe…
Vortex spectroscopy in the vortex glass: A real-space numerical approach
C. Berthod
A method is presented to solve the Bogoliubov-de Gennes equations with arbitrary distributions of vortices. The real-space Green's function approach based on Chebyshev polynomials…
Rise and fall of shape resonances in thin films of BCS superconductors
D. Valentinis, D. van der Marel, C. Berthod
The confinement of a superconductor in a thin film changes its Fermi-level density of states and is expected to change its critical temperature . Previous calculations have re…
BCS superconductivity near the band edge: Exact results for one and several bands
D. Valentinis, D. van der Marel, C. Berthod
We revisit the problem of a BCS superconductor in the regime where the Fermi energy is smaller than the Debye energy. This regime is relevant for low-density superconductors such a…
Bogoliubov quasiparticles coupled to the antiferromagnetic spin mode in a vortex core
C. Berthod
In copper- and iron-based unconventional superconductors, the Bogoliubov quasiparticles interact with a spin resonance at momentum . This interaction is revealed by specific…
Revisiting the vortex-core tunnelling spectroscopy in YBaCuO
Jens Bruér, Ivan Maggio-Aprile, Nathan Jenkins +5
The observation by scanning tunnelling spectroscopy (STS) of Abrikosov vortex cores in the high-temperature superconductor YBaCuO (Y123) has revealed a robust pair…
A theory of the strain-dependent critical field in Nb3Sn, based on anharmonic phonon generation
Davide Filippo Valentinis, Christophe Berthod, Bernardo Bordini +1
We propose a theory to explain the strain dependence of the critical properties in A15 superconductors. Starting from the strong-coupling formula for the critical temperature, and…
Quasiparticle spectra of Abrikosov vortices in a uniform supercurrent flow
C. Berthod
We calculate the local density of states of a vortex in a two-dimensional s-wave superconductor, in the presence of a uniform applied supercurrent. The supercurrent induces changes…
Strong-coupling analysis of scanning tunneling spectra in BiSrCaCuO
C. Berthod, Y. Fasano, I. Maggio-Aprile +4
We study a series of spectra measured in the superconducting state of optimally-doped Bi-2223 by scanning tunneling spectroscopy. Each spectrum, as well as the average of spectra p…
Evidence for a Fermi liquid in the pseudogap phase of high-Tc cuprates
S. I. Mirzaei, D. Stricker, J. N. Hancock +9
Cuprate high-T_c superconductors on the Mott-insulating side of "optimal doping" (with respect to the highest T_c's) exhibit enigmatic behavior in the non-superconducting state. Ne…
Tunneling conductance and local density of states in tight-binding junctions
C. Berthod, T. Giamarchi
We study the relationship between the differential conductance and the local density of states in tight-binding tunnel junctions where the junction' geometry can be varied between…
Tunneling spectra of strongly coupled superconductors: Role of dimensionality
C. Berthod
We investigate numerically the signatures of collective modes in the tunneling spectra of superconductors. The larger strength of the signatures observed in the high-Tc superconduc…
Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8
A. P. Petrović, R. Lortz, G. Santi +10
Sub-Kelvin scanning tunnelling spectroscopy in the Chevrel Phases SnMo6S8 and PbMo6S8 reveals two distinct superconducting gaps with Delta_1 = 3 meV, Delta_2 ~ 1.0 meV and Delta_1…