Pseudogap in a thin film of a conventional superconductor

Abstract

A superconducting state is characterized by the gap in the electronic density of states which vanishes at the superconducting transition temperature Tc. It was discovered that in high temperature superconductors a noticeable depression in the density of states still remains even at temperatures above Tc; this feature being called pseudogap. Here we show that a pseudogap exists in a conventional superconductor: ultrathin titanium nitride films over a wide range of temperatures above Tc. Our study reveals that this pseudogap state is induced by superconducting fluctuations and favored by two-dimensionality and by the proximity to the transition to the insulating state. A general character of the observed phenomenon provides a powerful tool to discriminate between fluctuations as the origin of the pseudogap state, and other contributions in the layered high temperature superconductor compounds.

26 pages, 4 figures

References in corpus (9)

• Scanning tunneling spectroscopy of high-temperature superconductors
• Visualizing pair formation on the atomic scale in the high-Tc superconductor Bi2Sr2CaCu2O8+d
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Diamagnetism and Cooper pairing above $T_c$ in cuprates
• Localized Superconductivity in the Quantum-Critical Region of the Disorder-Driven Superconductor-Insulator Transition in TiN Thin Films
• Quantum Metallicity on the High-Field Side of the Superconductor-Insulator Transition
• Doping Controlled Superconductor-Insulator Transition in Bi2Sr2-xLaxCaCu2O8+delta
• Nernst effect in the phase-fluctuating superconductor InO${}_x$
• Optical Properties of TiN Thin Films close to the Superconductor-Insulator Transition

Cited by in corpus (111)

• Localization of preformed Cooper-pairs in disordered superconductors
• Single-electron current sources: towards a refined definition of ampere
• Coherent quantum phase slip
• Single and two-particle energy gaps across the disorder-driven superconductor-insulator transition
• Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
• Quantum breakdown of superconductivity in low-dimensional materials
• Pseudogap from ARPES experiment: three gaps in cuprates and topological superconductivity
• Phase diagram of a strongly disordered s-wave superconductor, NbN, close to the metal-insulator transition
• Enhancement of superconductivity by Anderson localization
• Imaging superconducting vortex core and lattice with the scanning tunneling microscope
• High Field Studies of Superconducting Fluctuations in High-T_c Cuprates: Evidence for a Small Gap distinct from the Large Pseudogap
• Role of the vortex-core energy on the Beresinkii-Kosterlitz-Thouless transition in thin films of NbN
• Emergence of nanoscale inhomogeneity in the superconducting state of a homogeneously disordered conventional superconductor, NbN
• Universal scaling of the order-parameter distribution in strongly disordered superconductors
• Non-relativistic dynamics of the amplitude (Higgs) mode in superconductors
• Superconducting phase transitions in ultrathin TiN films
• Collective energy gap of preformed Cooper-pairs in disordered superconductors
• Electrodynamics of the Superconducting State in Ultra-Thin Films at THz Frequencies
• Effective medium theory for superconducting layers: A systematic analysis including space correlation effects
• Coherent Flux Tunneling Through NbN Nanowires
• Robustness of the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin NbN Films near the Superconductor-Insulator Transition
• When Superconductivity Crosses Over: From BCS to BEC
• Incoherent Cooper pairing and pseudogap behavior in single-layer FeSe/SrTiO${}_3$
• Pseudogaps in strongly interacting Fermi gases
• Level statistics of disordered spin-1/2 systems and its implications for materials with localized Cooper pairs
• Superfluid density and phase relaxation in superconductors with strong disorder
• Phases and phase transitions in two dimensional superconducting films
• Confinement of superconducting fluctuations due to emergent electronic inhomogeneities
• Direct evidence for Cooper pairing without a spectral gap in a disordered superconductor above $T_C$
• Non-linear $IV$ characteristics in two-dimensional superconductors: Berezinskii-Kosterlitz-Thouless physics vs inhomogeneity
• Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density-of-states suppression in ultrathin NbN films
• Optical excitation of phase modes in strongly disordered superconductors
• Superconductor-insulator transitions: Phase diagram and magnetoresistance
• Dynamical Conductivity Across The Disorder-Tuned Superconductor-Insulator Transition
• Frequency dependent superfluid stiffness in the pseudogap regime in strongly disordered NbN thin films
• Fermionic scenario for the destruction of superconductivity in ultrathin MoC films evidenced by STM measurements
• Universal Broadening of the Bardeen-Cooper-Schrieffer Coherence Peak of Disordered Superconducting Films
• Optical signatures of the superconducting Goldstone mode in granular aluminum: experiments and theory
• Competition between electron pairing and phase coherence in superconducting interfaces
• Direct observation of the superconducting gap in thin film of titanium nitride using terahertz spectroscopy
• Gate-controlled low carrier density superconductors: Toward the two-dimensional BCS-BEC crossover
• Magnetic field induced emergent inhomogeneity in a superconducting film with weak and homogeneous disorder
• Ultrafast carrier localisation in the pseudogap state of cuprate superconductors from coherent quench experiments
• Superconducting fluctuations in overdoped Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Broadening of the Berezinskii-Kosterlitz-Thouless transition by correlated disorder
• Nanopattern-stimulated superconductor-insulator transition in thin TiN films
• On the application of Mattis-Bardeen theory in strongly disordered superconductors
• High field termination of a Cooper-pair insulator
• Enhancement and termination of the superconducting proximity effect due to atomic-scale defects visualized by scanning tunneling microscopy
• Charge Berezinskii-Kosterlitz-Thouless transition in superconducting NbTiN films
• The role of Coulomb interaction in superconducting NbTiN thin films
• Collapse of the Cooper pair phase coherence length at a superconductor to insulator transition
• Destruction of superconductivity through phase fluctuations in ultrathin a-MoGe films
• Superconductor-Insulator Transition and Fermi-Bose Crossovers
• Superconductor-Insulator Transition in disordered Josephson junction chains
• Multifractally-enhanced superconductivity in thin films
• Observation of coexisting weak localization and superconducting fluctuations in strained Sn1-xInxTe thin films
• Superconducting Energy Scales and Anomalous Dissipative Conductivity in Thin Films of Molybdenum Nitride
• Local density of states and its mesoscopic fluctuations near the transition to a superconducting state in disordered systems
• Superconductivity-localization interplay and fluctuation magnetoresistance in epitaxial BaPb${}_{1-x}$Bi${}_x$O${}_3$ thin films
• Superconducting fluctuations in a thin NbN film probed by the Hall effect
• Microwave properties of superconductors close to SIT
• Slowing down of vortex motion in thin NbN films near the superconductor-insulator transition
• Charge Dynamics Across the Disorder Driven Superconductor-Insulator Transition
• Amplitude, density and current correlations of strongly disordered superconductors
• Disordered XY model: effective medium theory and beyond
• The Rise of Refractory Transition-Metal Nitride Films for Advanced Electronics and Plasmonics
• Momentum-resolved electronic structures and strong electronic correlations in graphene-like nitride superconductors
• Mechanism of screening or enhancing the pseudogap throughout the two-band Bardeen-Cooper-Schrieffer to Bose-Einstein condensate crossover
• Evidence for Superconducting Phase Coherence in the Metallic/Insulating Regime of the LaAlO3-SrTiO3 Interface Electron System
• Tunneling into the localized phase near Anderson transitions with Coulomb interaction
• Dimensionality, nematicity and Superconductivity in Fe-based systems
• Probing electron-electron interaction along with superconducting fluctuations in disordered TiN thin films
• A Robust nitridation technique for fabrication of disordered superconducting TiN thin films featuring phase slip events
• Photoemission spectra of massless Dirac fermions on the verge of exciton condensation
• Magnetic field induced transition from a vortex liquid to Bose metal in ultrathin a-MoGe thin film
• Superconducting fluctuations at arbitrary disorder strength
• Multifractally-enhanced superconductivity in two-dimensional systems with spin-orbit coupling
• Superconductivity in a disordered metal with Coulomb interactions
• Amplitude Fluctuations Driven by the Density of Electron Pairs within Nanosize Granular Structuters inside Strongly Disordered Superconductors: Evidence for a Shell-Like Effect
• Near-power-law temperature dependence of the superfluid stiffness in strongly disordered superconductors
• Signature of Cooper Pairs in the Non-Superconducting Phases of Amorphous Superconducting Tantalum Films
• Influence of electron irradiation on fluctuation conductivity and pseudogap in $YB{a}_{2}C{u}_3{O}_{7-\delta }$ single crystals
• Local density of state fluctuations in 2D superconductor as a probe of quantum diffusion
• Room temperature spin-orbit torque efficiency in sputtered low-temperature superconductor delta-TaN
• Observation of pseudogap in MgB2
• Robust pseudogap across the magnetic field driven superconductor to insulator-like transition in strongly disordered NbN films
• Studies on DC transport and terahertz conductivity of granular molybdenum thin films for microwave radiation detector applications
• Effective Hamiltonian based Monte Carlo for the BCS to BEC crossover in the attractive Hubbard model
• Fluctuation conductivity of disordered superconductors in magnetic fields
• Effect of site dilution in the two-dimensional attractive Hubbard model
• Neel proximity effect in superconductor/antiferromagnet heterostructures
• Mesoscopic fluctuations of the local density of states in interacting electron systems
• Surface symmetry breaking and disorder effects on superconductivity in perovskite BaBi3 epitaxial films
• Observation of a subharmonic gap singularity in interlayer tunneling characteristics of Bi2Sr2CaCu2O8+d
• Distribution of the order parameter in strongly disordered superconductors: An analytic theory
• Superconductivity in systems exhibiting the Altshuler-Aronov anomaly
• Charge-SQUID and Tunable Phase-slip Flux Qubit
• Slow electron-phonon relaxation controls the dynamics of the superconducting resistive transition
• Quantum Fluctuations and Multifractally-Enhanced Superconductivity in Disordered Thin Films
• Site-disorder driven superconductor-insulator transition: A dynamical mean field study
• Pseudogap isotope effect as a probe of bipolaron mechanism in high temperature superconductors
• Interplay between superconducting fluctuations and weak localization in disordered TiN thin films
• Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Superconducting gap and its Little-Parks like oscillations with high-order harmonics in lithium intercalated 1T-TiSe${}_2$
• Advanced approach of superconducting gap function extraction from tunneling experiments
• Disorder driven inhomogeneous phase in the 2D-superconducting film of titanium nitride
• Spectroscopic evidence of disorder-induced quantum phase transitions in monolayer Fe(Te,Se) superconductor
• On the bad metallicity and phase diagrams of Fe${}_{1+\delta }X$ ($X$ =Te, Se, S, solid solutions): an electrical resistivity study
• Large gap, a pseudogap and proximity effect in the Bi2Te3/Fe1+yTe interfacial superconductor
• Divergence of Dynamical Conductivity at Certain Percolative Superconductor-Insulator Transitions