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Publications (35)

cond-mat.supr-con2012

Break-up of long-range coherence due to phase fluctuations in ultrathin superconducting NbN films

Y. Noat, T. Cren, C. Brun +7

Using scanning tunneling spectroscopy (STS), we address the problem of the superconductor-insulator phase transition (SIT) in homogeneously disordered ultrathin (2-15 nm) films of…

cond-mat.mes-hall2007

Resonant excitonic emission of a single quantum dot in the Rabi regime

R. Melet, V. Voliotis, A. Enderlin +4

We report on coherent resonant emission of the fundamental exciton state in a single semiconductor GaAs quantum dot. Resonant regime with picoseconde laser excitation is realized b…

cond-mat.supr-con2005

Probing the superfluid velocity with a superconducting tip: the Doppler shift effect

A. Kohen, Th. Proslier, T. Cren +4

We address the question of probing the supercurrents in superconducting (SC) samples on a local scale by performing Scanning Tunneling Spectroscopy (STS) experiments with a SC tip.…

cond-mat.mtrl-sci2009

Electric field effects, Mott insulator, Surface patterning, Scanning tunneling microscopy, Transition metal chalcogenides

Vincent Dubost, T. Cren, C. Vaju +5

We report the first experimental evidence for a strong electromechanical coupling in the Mott insulator GaTa4Se8 allowing a highly reproducible nano-writing with a Scanning Tunneli…

cond-mat.mes-hall2017

Double Fe-impurity charge state in the topological insulator Bi $_{2}$ Se $_{3}$

V. S. Stolyarov, S. V. Remizov, D. S. Shapiro +10

The influence of individual impurities of Fe on the electronic properties of topological insulator Bi $_{2}$ Se $_{3}$ is studied by Scanning Tunneling Microscopy. The microscope tip is u…

cond-mat.supr-con2017

Direct Evidence of Spontaneous Abrikosov Vortex State in Ferromagnetic Superconductor EuFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ with $x = 0.21$

L. Ya. Vinnikov, I. S. Veshchunov, S. Yu. Grebenchuk +14

Using low-temperature Magnetic Force Microscopy (MFM) we provide direct experimental evidence for spontaneous vortex phase (SVP) formation in EuFe $_{2}$ (As $_{0.79}$ P $_{0.21}$ ) $_{2}$ si…

cond-mat.supr-con2000

Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor

T. Cren, D. Roditchev, W. Sacks +1

Using high speed scanning tunneling spectroscopy, we perform a full mapping of the quasiparticle density of states (DOS) in single crystals of BiPbSrCaCuO(2212). The measurements c…

cond-mat.str-el2022

On the importance of measuring accurately LDOS maps using scanning tunneling spectroscopy in materials presenting atom-dependent charge order: the case of the correlated Pb/Si(111) single atomic layer

C. Tresca, T. Bilgeri, G. Menard +11

We show how to properly extract the local charge order in two-dimensional materials from scanning tunneling microscopy/spectroscopy (STM/STS) measurements. When the charge order pr…

cond-mat.supr-con2007

Local tunneling spectroscopy of the electron-doped cuprate Sm1.85Ce0.15CuO4

A. Zimmers, Y. Noat, T. Cren +4

We present local tunneling spectroscopy in the optimally electron-doped cuprate Sm2-xCexCuO4 x=0.15. A clear signature of the superconducting gap is observed with an amplitude rang…

cond-mat.supr-con2018

Unique interplay between superconducting and ferromagnetic orders in EuRbFe $_{4}$ As $_{4}$

V. S. Stolyarov, A. Casano, M. A. Belyanchikov +15

Transport, magnetic and optical investigations on EuRbFe $_{4}$ As $_{4}$ single crystals evidence that the ferromagnetic ordering of the Eu $^{2 +}$ magnetic moments at $T_{N} = 15$ K, below t…

cond-mat.mes-hall2014

Surface states in a 3D topological insulator: The role of hexagonal warping and curvature

E. V. Repin, V. S. Stolyarov, T. Cren +5

We explore a combined effect of hexagonal warping and of finite effective mass on both the tunneling density of electronic states (TDOS) and structure of Landau levels (LLs) of 3D…

cond-mat.supr-con2006

Scanning Tunneling Spectroscopy on the novel superconductor CaC6

N. Bergeal, V. Dubost, Y. Noat +7

We present scanning tunneling microscopy and spectroscopy of the newly discovered superconductor CaC $_{6}$ . The tunneling conductance spectra, measured between 3 K and 15 K, show a c…

cond-mat.str-el2018

Chiral spin texture in the charge-density-wave phase of the correlated metallic Pb/Si(111) monolayer

C. Tresca, C. Brun, T. Bilgeri +10

We investigate the 1/3 monolayer $I^\pm$ -Pb/Si(111) surface by scanning tunneling spectroscopy (STS) and fully relativistic first-principles calculations. We study both the high-tempe…

cond-mat.supr-con2006

Quasiparticle spectrum of the cuprate BiSrCaCuO: Possible connection to the phase diagram

W. Sacks, T. Cren, D. Roditchev +1

We previously introduced [T. Cren et al., Europhys. Lett. 52, 203 (2000)] an energy-dependant gap function, $I^ (E)$ , that fits the unusual shape of the quasiparticle (QP) spectrum…

cond-mat.supr-con2006

Probing the superconducting condensate on a nanometer scale

Th. Proslier, A. Kohen, Y. Noat +3

Superconductivity is a rare example of a quantum system in which the wavefunction has a macroscopic quantum effect, due to the unique condensate of electron pairs. The amplitude of…

cond-mat.supr-con2014

Proximity effect between two superconductors spatially resolved by scanning tunneling spectroscopy

V. Cherkez, J. C. Cuevas, C. Brun +5

We present a combined experimental and theoretical study of the proximity effect in an atomic-scale controlled junction between two different superconductors. Elaborated on a Si(11…

cond-mat.supr-con2014

Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon

C. Brun, T. Cren, V. Cherkez +8

In bulk materials superconductivity is remarkably robust with respect to non-magnetic disorder. In the two-dimensional limit however, the quantum condensate suffers from the effect…

cond-mat.supr-con2010

Disorder effects in pnictides : a tunneling spectroscopy study

Y. Noat, T. Cren, V. Dubost +6

We present the synthesis and the tunneling spectroscopy study of superconducting FeSe0.5Te0.5 (Tc = 14 K), SmFeAsO0.85 (Tc = 45 K) and SmFeAsO0.9F0.1 (Tc = 52 K). The samples were…

cond-mat.supr-con2021

Novel magnetic stoichiometric superconductor EuRbFe4As4

T. K. Kim, K. S. Pervakov, V. A. Vlasenko +16

In the novel stoichiometric iron-based material RbEuFe4As4 superconductivity coexists with a peculiar long-range magnetic order of Eu 4f states; their coexistance is puzzling and r…

cond-mat.str-el2009

Electric Pulse Induced Resistive Switching, Electronic Phase Separation, and Possible Superconductivity in a Mott insulator

C. Vaju, L. Cario, B. Corraze +6

Metal-insulator transitions (MIT) belong to a class of fascinating physical phenomena, which includes superconductivity, and colossal magnetoresistance (CMR), that are associated w…

cond-mat.supr-con2004

Fabrication and characterization of scanning tunneling microscopy superconducting Nb tips having highly enhanced critical fields

A. Kohen, Y. Noat, T. Proslier +4

We report a simple method for the fabrication of Niobium superconducting (SC) tips for scanning tunnelling microscopy which allow atomic resolution. The tips, formed in-situ by the…

cond-mat.supr-con2006

Local Tunneling Study of Three-Dimensional Order Parameter in the $I ¨ $ -band of Al-doped MgB $_{2}$ Single Crystals

F. Giubileo, F. Bobba, A. Scarfato +5

We have performed local tunneling spectroscopy on high quality Mg $_{1 - x}$ Al $_{x}$ B $_{2}$ single crystals by means of Variable Temperature Scanning Tunneling Spectroscopy (STS) in magne…

cond-mat.supr-con2026

Microscopic structure of the vortex cores in granular niobium: A coherent quantum puzzle

V. S. Stolyarov, V. Neverov, A. V. Krasavin +12

When macroscopic quantum condensates -- superconductors, superfluids, cold atoms and ions, polaritons etc. -- are put in rotation, a quantum vortex lattice forms inside. In homogen…

cond-mat.supr-con2025

Magnetic force microscopy versus scanning quantum-vortex microscopy: Probing pinning landscape in granular niobium films

A. Yu. Aladyshkin, R. A. Hovhannisyan, S. Yu. Grebenchuk +7

We provide an overview of the methodology and fundamental principles associated with newly developed experimental technique -- scanning quantum-vortex microscopy [Hovhannisyan et a…

cond-mat.supr-con2000

Constraints on the Quasiparticle Density of States in High- $T_{c}$ Superconductors

T. Cren, D. Roditchev, W. Sacks +1

In this Letter we present new tunneling data on YBa $_{2}$ Cu $_{3}$ O $_{7}$ thin films by low temperature scanning tunneling spectroscopy. Unusual peak-dip-hump features, previously reporte…

cond-mat.supr-con2001

Two Gap State Density in MgB $_{2}$ : A True Bulk Property or A Proximity Effect?

F. Giubileo, D. Roditchev, W. Sacks +7

We report on the temperature dependence of the quasiparticle density of states (DOS) in the simple binary compound MgB2 directly measured using scanning tunneling microscope (STM).…

cond-mat.supr-con2004

Two regimes in the magnetic field response of superconducting MgB $_{2}$

A. Kohen, F. Giubileo, Th. Proslier +10

Using Scanning Tunneling Microscope at low temperature we explore the superconducting phase diagram in the $I ¨ $ -band of the two-band superconductor MgB $_{2}$ . In this band the peculi…

physics.app-ph2017

Proximity effect model of ultra-narrow NbN strips

I. Charaev, T. Silbernagel, B. Bachowsky +7

We show that narrow superconducting strips in superconducting (S) and normal (N) states are universally described by the model presenting them as lateral NSN proximity systems in w…

cond-mat.supr-con2014

Scanning tunneling spectroscopy study of the proximity effect in a disordered two-dimensional metal

L. Serrier-Garcia, J. C. Cuevas, T. Cren +6

The proximity effect between a superconductor and a highly diffusive two-dimensional metal was revealed in a Scanning Tunneling Spectroscopy experiment. The in-situ elaborated samp…

cond-mat.supr-con2020

Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density-of-states suppression in ultrathin NbN films

C. Carbillet, V. Cherkez, M. A. Skvortsov +10

Disorder has different profound effects on superconducting thin films. For a large variety of materials, increasing disorder reduces electronic screening which enhances electron-el…

cond-mat.supr-con2001

Strong Coupling and Double Gap Density of States in Superconducting MgB2

F. Giubileo, D. Roditchev, W. Sacks +2

Using scanning tunneling spectroscopy at T = 4.2 K, we perform simultaneously the topographic imaging and the quasiparticle density of states (DOS) mapping in granular MgB2. We obs…

cond-mat.mtrl-sci2025

Selective band engineering of Bi/Si(111) by boron segregation

E. Barre, J. Villalobos-Castro, T. Pierron +4

Atomically thin layers of metals deposited on semiconductors display a variety of physical properties such as superconductivity, charge density waves, topological phases, strong sp…

cond-mat.supr-con2020

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe $_{4}$ As $_{4}$

T. K. Kim, K. S. Pervakov, D. V. Evtushinsky +13

In the novel stoichiometric iron-based material RbEuFe $_{4}$ As $_{4}$ superconductivity coexists with a peculiar long-range magnetic order of Eu 4f states. Using angle-resolved phot…

cond-mat.supr-con2015

Confinement of superconducting fluctuations due to emergent electronic inhomogeneities

C. Carbillet, S. Caprara, M. Grilli +11

The microscopic nature of an insulating state in the vicinity of a superconducting state, in the presence of disorder, is a hotly debated question. While the simplest scenario prop…

physics.app-ph2017

Enhancement of superconductivity in NbN nanowires by negative electron-beam lithography with positive resist

I. Charaev, T. Silbernagel, B. Bachowsky +7

We performed comparative experimental investigation of superconducting NbN nanowires which were prepared by means of positive-and negative electron-beam lithography with the same p…

Publications (35)

Break-up of long-range coherence due to phase fluctuations in ultrathin superconducting NbN films

Resonant excitonic emission of a single quantum dot in the Rabi regime

Probing the superfluid velocity with a superconducting tip: the Doppler shift effect

Electric field effects, Mott insulator, Surface patterning, Scanning tunneling microscopy, Transition metal chalcogenides

Double Fe-impurity charge state in the topological insulator Bi2​Se3​

Direct Evidence of Spontaneous Abrikosov Vortex State in Ferromagnetic Superconductor EuFe2​(As1−x​Px​)2​ with x=0.21

Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor

On the importance of measuring accurately LDOS maps using scanning tunneling spectroscopy in materials presenting atom-dependent charge order: the case of the correlated Pb/Si(111) single atomic layer

Local tunneling spectroscopy of the electron-doped cuprate Sm1.85Ce0.15CuO4

Unique interplay between superconducting and ferromagnetic orders in EuRbFe4​As4​

Surface states in a 3D topological insulator: The role of hexagonal warping and curvature

Scanning Tunneling Spectroscopy on the novel superconductor CaC6

Chiral spin texture in the charge-density-wave phase of the correlated metallic Pb/Si(111) monolayer

Quasiparticle spectrum of the cuprate BiSrCaCuO: Possible connection to the phase diagram

Probing the superconducting condensate on a nanometer scale

Proximity effect between two superconductors spatially resolved by scanning tunneling spectroscopy

Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon

Disorder effects in pnictides : a tunneling spectroscopy study

Novel magnetic stoichiometric superconductor EuRbFe4As4

Electric Pulse Induced Resistive Switching, Electronic Phase Separation, and Possible Superconductivity in a Mott insulator

Fabrication and characterization of scanning tunneling microscopy superconducting Nb tips having highly enhanced critical fields

Local Tunneling Study of Three-Dimensional Order Parameter in the I¨-band of Al-doped MgB2​ Single Crystals

Microscopic structure of the vortex cores in granular niobium: A coherent quantum puzzle

Magnetic force microscopy versus scanning quantum-vortex microscopy: Probing pinning landscape in granular niobium films

Constraints on the Quasiparticle Density of States in High-Tc​ Superconductors

Two Gap State Density in MgB2​: A True Bulk Property or A Proximity Effect?

Two regimes in the magnetic field response of superconducting MgB2​

Proximity effect model of ultra-narrow NbN strips

Scanning tunneling spectroscopy study of the proximity effect in a disordered two-dimensional metal

Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density-of-states suppression in ultrathin NbN films

Strong Coupling and Double Gap Density of States in Superconducting MgB2

Selective band engineering of Bi/Si(111) by boron segregation

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe4​As4​

Confinement of superconducting fluctuations due to emergent electronic inhomogeneities

Enhancement of superconductivity in NbN nanowires by negative electron-beam lithography with positive resist

Double Fe-impurity charge state in the topological insulator Bi $_{2}$ Se $_{3}$

Direct Evidence of Spontaneous Abrikosov Vortex State in Ferromagnetic Superconductor EuFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ with $x = 0.21$

Unique interplay between superconducting and ferromagnetic orders in EuRbFe $_{4}$ As $_{4}$

Local Tunneling Study of Three-Dimensional Order Parameter in the $I ¨ $ -band of Al-doped MgB $_{2}$ Single Crystals

Constraints on the Quasiparticle Density of States in High- $T_{c}$ Superconductors

Two Gap State Density in MgB $_{2}$ : A True Bulk Property or A Proximity Effect?

Two regimes in the magnetic field response of superconducting MgB $_{2}$

When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe $_{4}$ As $_{4}$