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Park, Sungyu; Kim, So Young; Kim, Hyoung Kug; Kim, Min Jeong; Kim, Taeho; Kim, Hoon; Choi, Gyu Seung; Won, C. J.; Kim, Sooran; Kim, Kyoo; Talantsev, Evgeny F.; Watanabe, Kenji; Taniguchi, Takashi; Cheong, Sang-Wook; Kim, B. J.; Yeom, H. W.; Kim, Jonghwan; Kim, Tae-Hwan; Kim, Jun Sung
Nature communications, 05/2021, Letnik: 12, Številka: 1Journal Article
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 IrTe 2 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 IrTe 2 nanoflakes significantly increases the out-of-plane coherence length and the coupling strength of superconductivity, in contrast to the doped bulk IrTe 2 . These findings clarify that the inherent instabilities of the parent stripe phase are sufficient to induce superconductivity in IrTe 2 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.
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