Two-dimensional superconductor-insulator quantum phase transitions in an electron-doped cuprate

Zeng, S. W.; Huang, Z.; Lv, W. M.; Bao, N. N.; Gopinadhan, K.; Jian, L. K.; Herng, T. S.; Liu, Z. Q.; Zhao, Y. L.; Li, C. J.; Harsan Ma, H. J.; Yang, P.; Ding, J.; Venkatesan, T.; Ariando, .

doi:10.1103/PhysRevB.92.020503

Two-dimensional superconductor-insulator quantum phase transitions in an electron-doped cuprate

Journal Article · Mon Jul 06 04:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.020503· OSTI ID:1329126

Zeng, S. W. ^[1]; Huang, Z. ^[1]; Lv, W. M. ^[1]; Bao, N. N. ^[1]; Gopinadhan, K. ^[1]; Jian, L. K. ^[1]; Herng, T. S. ^[1]; Liu, Z. Q. ^[2]; Zhao, Y. L. ^[1]; Li, C. J. ^[1]; Harsan Ma, H. J. ^[1]; Yang, P. ^[1]; Ding, J. ^[1]; Venkatesan, T. ^[1]; Ariando, . ^[1]

National Univ. of Singapore (Singapore)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we use an ionic liquid-assisted electric-field effect to tune the carrier density in an electron-doped cuprate ultrathin film and cause a two-dimensional superconductor-insulator transition (SIT). The low upper critical field in this system allows us to perform magnetic-field (B)-induced SIT in the liquid-gated superconducting film. Finite-size scaling analysis indicates that SITs induced both by electric and by magnetic fields are quantum phase transitions and the transitions are governed by percolation effects-quantum mechanical in the former and classical in the latter cases. Compared to the hole-doped cuprates, the SITs in the electron-doped system occur at critical sheet resistances (R_c) much lower than the pair quantum resistance R_Q = h/(2e)² = 6.45 kΩ, suggesting the possible existence of fermionic excitations at finite temperatures at the insulating phase near the SITs.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1329126

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 2 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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