Metastable Superconductivity in Two-Dimensional IrTe2 Crystals

Masaro Yoshida, Kazutaka Kudo, Minoru Nohara, Yoshihiro Iwasa

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Two-dimensional (2D) materials exhibit unusual physical and chemical properties that are attributed to the thinning-induced modification of their electronic band structure. Recently, reduced thickness was found to dramatically impact not only the static electronic structure, but also the dynamic ordering kinetics. The ordering kinetics of first-order phase transitions becomes significantly slowed with decreasing thickness, and metastable supercooled states can be realized by thinning alone. We therefore focus on layered iridium ditelluride (IrTe2), a charge-ordering system that is transformed into a superconductor by suppressing its first-order transition. Here, we discovered a persistent superconducting zero-resistance state in mechanically exfoliated IrTe2 thin flakes. The maximum superconducting critical temperature (Tc) was identical to that which is chemically optimized, and the emergent superconductivity was revealed to have a metastable nature. The discovered robust metastable superconductivity suggests that 2D material is a new platform to induce, control, and functionalize metastable electronic states that are inaccessible in bulk crystals.

    Original languageEnglish
    Pages (from-to)3113-3117
    Number of pages5
    JournalNano Letters
    Volume18
    Issue number5
    DOIs
    Publication statusPublished - May 9 2018

    Keywords

    • IrTe
    • Two-dimensional material
    • metastable state
    • superconductivity

    ASJC Scopus subject areas

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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