Vortex phase transitions in monolayer FeSe film on SrTiO3

Weiwei Zhao; Cui Zu Chang; Xiaoxiang Xi; Kin Fai Mak; Jagadeesh S. Moodera

doi:10.1088/2053-1583/3/2/024006

Vortex phase transitions in monolayer FeSe film on SrTiO₃

Weiwei Zhao, Cui Zu Chang, Xiaoxiang Xi, Kin Fai Mak, Jagadeesh S. Moodera

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The voltage-current (V-I) characteristics in superconducting monolayer FeSe film on SrTiO₃ (100) under different magnetic fields are investigated. The zero-fieldV-I 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 of J) 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.

Original language	English (US)
Article number	024006
Journal	2D Materials
Volume	3
Issue number	2
DOIs	https://doi.org/10.1088/2053-1583/3/2/024006
State	Published - Apr 28 2016

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1088/2053-1583/3/2/024006

Cite this

@article{098d32beb11840dbb6ed79e567ec07a0,

title = "Vortex phase transitions in monolayer FeSe film on SrTiO3",

abstract = "The voltage-current (V-I) characteristics in superconducting monolayer FeSe film on SrTiO3 (100) under different magnetic fields are investigated. The zero-fieldV-I 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 (Rsq-J) dependence changes from ohmic (Rsq independent of J) to non-ohmic (a nonlinear dependence of Rsq 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.",

author = "Weiwei Zhao and Chang, {Cui Zu} and Xiaoxiang Xi and Mak, {Kin Fai} and Moodera, {Jagadeesh S.}",

note = "Funding Information: We thank Moses H W Chan for fruitful discussions. This work was funded by the Penn State MRSEC, Center for Nanoscale Science, under award NSF DMR-1420620. KFM acknowledges support from the US Department of Energy, Office of Basic Energy Sciences under contract DESC0013883. Work at MIT is supported by the grants NSF DMR-1207469 and ONR N00014-13-1-0301, and the STC Center for Integrated Quantum Materials under NSF grant DMR-1231319. Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

year = "2016",

month = apr,

day = "28",

doi = "10.1088/2053-1583/3/2/024006",

language = "English (US)",

volume = "3",

journal = "2D Materials",

issn = "2053-1583",

publisher = "IOP Publishing Ltd.",

number = "2",

}

TY - JOUR

T1 - Vortex phase transitions in monolayer FeSe film on SrTiO3

AU - Zhao, Weiwei

AU - Chang, Cui Zu

AU - Xi, Xiaoxiang

AU - Mak, Kin Fai

AU - Moodera, Jagadeesh S.

N1 - Funding Information: We thank Moses H W Chan for fruitful discussions. This work was funded by the Penn State MRSEC, Center for Nanoscale Science, under award NSF DMR-1420620. KFM acknowledges support from the US Department of Energy, Office of Basic Energy Sciences under contract DESC0013883. Work at MIT is supported by the grants NSF DMR-1207469 and ONR N00014-13-1-0301, and the STC Center for Integrated Quantum Materials under NSF grant DMR-1231319. Publisher Copyright: © 2016 IOP Publishing Ltd.

PY - 2016/4/28

Y1 - 2016/4/28

N2 - The voltage-current (V-I) characteristics in superconducting monolayer FeSe film on SrTiO3 (100) under different magnetic fields are investigated. The zero-fieldV-I 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 (Rsq-J) dependence changes from ohmic (Rsq independent of J) to non-ohmic (a nonlinear dependence of Rsq 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.

AB - The voltage-current (V-I) characteristics in superconducting monolayer FeSe film on SrTiO3 (100) under different magnetic fields are investigated. The zero-fieldV-I 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 (Rsq-J) dependence changes from ohmic (Rsq independent of J) to non-ohmic (a nonlinear dependence of Rsq 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.

UR - http://www.scopus.com/inward/record.url?scp=84977642288&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84977642288&partnerID=8YFLogxK

U2 - 10.1088/2053-1583/3/2/024006

DO - 10.1088/2053-1583/3/2/024006

M3 - Article

AN - SCOPUS:84977642288

SN - 2053-1583

VL - 3

JO - 2D Materials

JF - 2D Materials

IS - 2

M1 - 024006

ER -

Vortex phase transitions in monolayer FeSe film on SrTiO₃

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this