Vortex-induced quantum metallicity in the mono-unit-layer superconductor NbS e2

Satoru Ichinokura, Yuki Nakata, Katsuaki Sugawara, Yukihiro Endo, Akari Takayama, Takashi Takahashi, Shuji Hasegawa

Research output: Contribution to journalArticle

Abstract

We performed in situ magnetoresistance measurements in the ultrahigh-vacuum environment to reveal the quantum phase transitions of single unit-layer NbSe2 epitaxially grown on bilayer graphene. It was found that the superconductor-normal state transition caused by the surface-normal magnetic field was intermediated by a quasimetallic state. This behavior is consistent with the "Bose metal" picture where a finite dissipation is caused by the breaking of phase coherence due to strong gauge-field fluctuation. On one hand, around the mean-field critical temperature, the onset of transition from the normal state to the low-temperature states was governed by the amplitude-fluctuation effect, prominently under the magnetic field. We applied scaling theories to determine the phase boundaries. The result of scaling analyses revealed a complex but essential phase diagram of the single unit-layer NbSe2 as a two-dimensional superconductor.

Original languageEnglish
Article number220501
JournalPhysical Review B
Volume99
Issue number22
DOIs
Publication statusPublished - 2019 Jun 5

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Superconducting materials
metallicity
Vortex flow
vortices
Magnetic fields
Graphite
Ultrahigh vacuum
Phase boundaries
Magnetoresistance
Graphene
Gages
Phase diagrams
scaling
phase coherence
Phase transitions
Metals
in situ measurement
magnetic fields
Temperature
ultrahigh vacuum

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ichinokura, S., Nakata, Y., Sugawara, K., Endo, Y., Takayama, A., Takahashi, T., & Hasegawa, S. (2019). Vortex-induced quantum metallicity in the mono-unit-layer superconductor NbS e2. Physical Review B, 99(22), [220501]. https://doi.org/10.1103/PhysRevB.99.220501

Vortex-induced quantum metallicity in the mono-unit-layer superconductor NbS e2. / Ichinokura, Satoru; Nakata, Yuki; Sugawara, Katsuaki; Endo, Yukihiro; Takayama, Akari; Takahashi, Takashi; Hasegawa, Shuji.

In: Physical Review B, Vol. 99, No. 22, 220501, 05.06.2019.

Research output: Contribution to journalArticle

Ichinokura, S, Nakata, Y, Sugawara, K, Endo, Y, Takayama, A, Takahashi, T & Hasegawa, S 2019, 'Vortex-induced quantum metallicity in the mono-unit-layer superconductor NbS e2', Physical Review B, vol. 99, no. 22, 220501. https://doi.org/10.1103/PhysRevB.99.220501
Ichinokura, Satoru ; Nakata, Yuki ; Sugawara, Katsuaki ; Endo, Yukihiro ; Takayama, Akari ; Takahashi, Takashi ; Hasegawa, Shuji. / Vortex-induced quantum metallicity in the mono-unit-layer superconductor NbS e2. In: Physical Review B. 2019 ; Vol. 99, No. 22.
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