Journal
2D MATERIALS
Volume 3, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/3/2/024006
Keywords
1UC FeSe/SrTiO3; 2D superconductor; vortex phase transition
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Funding
- Penn State MRSEC, Center for Nanoscale Science [NSF DMR-1420620]
- US Department of Energy, Office of Basic Energy Sciences [DESC0013883]
- NSF [DMR-1207469]
- ONR [N00014-13-1-0301]
- STC Center for Integrated Quantum Materials under NSF [DMR-1231319]
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The voltage current (V-I) characteristics in superconducting monolayer FeSe film on SrTiO3 (100) under different magnetic fields are investigated. The zero-field result exhibits signatures of a Berezinski Kosterlitz Thouless transition, a characteristic of two-dimensional (2D) superconductors. Under an applied magnetic field, with current density lower than the critical current density, the sheet resistance versus current density (R-sq-J)dependence changes from ohmic (R-sq independent ofJ) to non-ohmic (a nonlinear dependence of R-sq on J) as the temperature decreases, indicative of a vortex phase transition/crossover. We interpret the high-temperature phase as the vortex liquid phase and the low-temperature phase as the vortex slush phase, which has short-ranged vortex lattice correlation, while long-range correlation (i.e. true superconductivity) is absent. No transition into a vortex glass phase is seen, illustrating the importance of thermal fluctuations in a perfect 2D superconductor under a magnetic field.
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