Superconductivity emerging from a stripe charge order in IrTe2 nanoflakes

Sungyu Park, So Young Kim, Hyoung Kug Kim, Min Jeong Kim, Taeho Kim, Hoon Kim, Gyu Seung Choi, C. J. Won, Sooran Kim, Kyoo Kim, Evgeny F. Talantsev, Kenji Watanabe, Takashi Taniguchi, Sang-Wook Cheong, B. J. Kim, H. W. Yeom, Jonghwan Kim (), Tae-Hwan Kim () and Jun Sung Kim ()
Additional contact information
Sungyu Park: Institute for Basic Science
So Young Kim: Institute for Basic Science
Hyoung Kug Kim: Pohang University of Science and Technology
Min Jeong Kim: Institute for Basic Science
Taeho Kim: Institute for Basic Science
Hoon Kim: Institute for Basic Science
Gyu Seung Choi: Institute for Basic Science
C. J. Won: Pohang Accelerator Laboratory
Sooran Kim: Kyungpook National University
Kyoo Kim: Korea Atomic Energy Research Institute (KAERI)
Evgeny F. Talantsev: Russian Academy of Sciences
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Sang-Wook Cheong: Pohang Accelerator Laboratory
B. J. Kim: Institute for Basic Science
H. W. Yeom: Institute for Basic Science
Jonghwan Kim: Institute for Basic Science
Tae-Hwan Kim: Pohang University of Science and Technology
Jun Sung Kim: Institute for Basic Science

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Superconductivity in the vicinity of a competing electronic order often manifests itself with a superconducting dome, centered at a presumed quantum critical point in the phase diagram. This common feature, found in many unconventional superconductors, has supported a prevalent scenario in which fluctuations or partial melting of a parent order are essential for inducing or enhancing superconductivity. Here we present a contrary example, found in IrTe2 nanoflakes of which the superconducting dome is identified well inside the parent stripe charge ordering phase in the thickness-dependent phase diagram. The coexisting stripe charge order in IrTe2 nanoflakes significantly increases the out-of-plane coherence length and the coupling strength of superconductivity, in contrast to the doped bulk IrTe2. These findings clarify that the inherent instabilities of the parent stripe phase are sufficient to induce superconductivity in IrTe2 without its complete or partial melting. Our study highlights the thickness control as an effective means to unveil intrinsic phase diagrams of correlated van der Waals materials.

Date: 2021
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DOI: 10.1038/s41467-021-23310-w

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