Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl, Pb)

T. Nakamura, H. Kim, S. Ichinokura, Akari Takayama, A. V. Zotov, A. A. Saranin, Y. Hasegawa, S. Hasegawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We present results of low-temperature scanning tunneling microscopy/spectroscopy measurements on the one-atom-layer superconductor, Si(111)-√3×√3-(Tl,Pb) which has a spin-split band structure due to the Rashba-Bychkov effect. It was revealed that it has a multiple superconducting gap Δ with significant anisotropy and sizable magnitude of 2Δ/kBTC∼8.6(kB is the Boltzmann constant and TC is the critical superconducting temperature). Under the magnetic field, a dip structure was observed even at the core of the vortex. The dip structure was like a "pseudogap" because it remained up to 2 T, well above the upper critical magnetic field determined in the transport measurements (∼0.7 T). This unconventional behavior suggests the possibility of spin-triplet Cooper pairs related to parity-broken superconductors.

Original languageEnglish
Article number134505
JournalPhysical Review B
Volume98
Issue number13
DOIs
Publication statusPublished - 2018 Oct 16
Externally publishedYes

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Superconductivity
Superconducting materials
superconductivity
Magnetic fields
Atoms
Scanning tunneling microscopy
magnetic fields
Band structure
atoms
scanning tunneling microscopy
parity
Vortex flow
Anisotropy
Spectroscopy
vortices
Temperature
anisotropy
spectroscopy
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Nakamura, T., Kim, H., Ichinokura, S., Takayama, A., Zotov, A. V., Saranin, A. A., ... Hasegawa, S. (2018). Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl, Pb). Physical Review B, 98(13), [134505]. https://doi.org/10.1103/PhysRevB.98.134505

Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl, Pb). / Nakamura, T.; Kim, H.; Ichinokura, S.; Takayama, Akari; Zotov, A. V.; Saranin, A. A.; Hasegawa, Y.; Hasegawa, S.

In: Physical Review B, Vol. 98, No. 13, 134505, 16.10.2018.

Research output: Contribution to journalArticle

Nakamura, T, Kim, H, Ichinokura, S, Takayama, A, Zotov, AV, Saranin, AA, Hasegawa, Y & Hasegawa, S 2018, 'Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl, Pb)', Physical Review B, vol. 98, no. 13, 134505. https://doi.org/10.1103/PhysRevB.98.134505
Nakamura, T. ; Kim, H. ; Ichinokura, S. ; Takayama, Akari ; Zotov, A. V. ; Saranin, A. A. ; Hasegawa, Y. ; Hasegawa, S. / Unconventional superconductivity in the single-atom-layer alloy Si(111)-√3×√3-(Tl, Pb). In: Physical Review B. 2018 ; Vol. 98, No. 13.
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