Study on fluctuations of interface-enhanced superconductivity in ultrathin FeSe/SrTiO3 by the Nernst effect

Abstract

Ultrathin FeSe films on SrTiO3 substrate show interface-enhanced superconductivity. However, how the superconductivity is established including superconducting fluctuations remains unclear. This study investigates the Nernst effect, which is sensitive to superconducting fluctuations, in ultrathin FeSe films on SrTiO3. Temperature dependence of Nernst signals in the normal state is similar to bulk FeSe, suggesting that the electrons of SrTiO3 are transferred only to a few layers near the FeSe/SrTiO3 interface. The Nernst effect caused by SC fluctuations was observed only below T ~ 1.2 Tconset within our measurement resolution, which is similar to other Fe chalcogenide systems. Our results suggest that the pseudogap in monolayer FeSe/STO possibly originates in other electronic states rather than superconductivity.

arXiv comment8 pages, 6 figures

References in corpus (39)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Phase Diagram and High Temperature Superconductivity at 65 K in Tuning Carrier Concentration of Single-Layer FeSe Films
• Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3
• The Nernst effect in high-$T_c$ superconductors
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• Phonon-enhanced superconductivity at the FeSe/SrTiO3 interface
• Gaussian superconducting fluctuations, thermal transport, and the Nernst effect
• Disentangling Cooper-pair formation above Tc from the pseudogap state in the cuprates
• The Nernst effect and the boundaries of the Fermi liquid picture
• Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films
• Multiple Energy Scales and Anisotropic Energy Gap in the Charge-Density-Wave Phase of Kagome Superconductor CsV3Sb5
• Broadening of the Beresinkii-Kosterlitz-Thouless superconducting transition by inhomogeneity and finite-size effects
• Spectroscopic Fingerprint of Phase-Incoherent Superconductivity in the Cuprate Pseudogap State
• Pseudogap temperature $T^{\star }$ of cuprate superconductors from the Nernst effect
• Observation of the Nernst signal generated by fluctuating Cooper pairs
• Direct spectroscopic evidence for phase competition between the pseudogap and superconductivity in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Origin of charge transfer and enhanced electron-phonon coupling in single unit-cell FeSe films on SrTiO3
• Onset of the Meissner effect at 65 K in FeSe thin film grown on Nb doped SrTiO3 substrate
• Decrease of upper critical field with underdoping in cuprate superconductors
• Preformed Cooper pairs in layered FeSe-based superconductors
• Nernst effect, quasiparticles, and d-density waves in cuprates
• Incoherent Cooper pairing and pseudogap behavior in single-layer FeSe/SrTiO${}_3$
• Fluctuations of the superconducting order parameter as an origin of the Nernst effect
• Nernst effect in the electron-doped cuprate superconductor PCCO: Superconducting fluctuations, upper critical field Hc2, and the origin of the Tc dome
• Experimental Setup for the Measurement of the Thermoelectric Power in Zero and Applied Magnetic Field
• Critical microwave-conductivity fluctuations across the phase diagram of superconducting La${}_{2-x}$Sr${}_x$CuO${}_4$ thin films
• Nernst effect as a probe of superconducting fluctuations in disordered thin films
• BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe
• Quantum criticality at the superconductor insulator transition probed by the Nernst effect
• Universal bound to the amplitude of the vortex Nernst signal in superconductors
• Direct evidence of superconductivity and determination of the superfluid density in buried ultrathin FeSe grown on SrTiO${}_3$
• Interface superconductivity in FeSe thin films on SrTiO${}_3$grown by the PLD technique
• Superconducting fluctuations in FeSe${}_{0.5}$Te${}_{0.5}$ thin films probed via microwave spectroscopy
• Nernst response, viscosity and mobile entropy in vortex liquids
• Checkerboard order state in superconducting FeSe/SrTiO3(001) monolayer
• Anisotropy of upper critical fields and interface superconductivity in FeSe/SrTiO3 grown by PLD
• A quantitative description of Nernst effect in high-temperature superconductors
• Suppression and revival of superconducting phase coherence in monolayer FeSe/SrTiO${}_3$

Cited by in corpus (1)

• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique