Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2

Amritroop Achari; Jonas Bekaert; Vishnu Sreepal; Andrey Orekhov; Piranavan Kumaravadivel; Minsoo Kim; Nicolas Gauquelin; Premlal Balakrishna Pillai; Johan Verbeeck; Francois M. Peeters; Andre K. Geim; Milorad V. Milošević; Rahul R. Nair

doi:10.1021/acs.nanolett.2c01851

Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2

Amritroop Achari, Jonas Bekaert, Vishnu Sreepal, Andrey Orekhov, Piranavan Kumaravadivel, Minsoo Kim, Nicolas Gauquelin, Premlal Balakrishna Pillai, Johan Verbeeck, Francois M. Peeters, Andre K. Geim, Milorad V. Milošević, Rahul R. Nair

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Abstract

Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in nature. Unfortunately, this approach is currently limited to only a few layers that can be stacked on top of each other. Here we report a bulk vdW material consisting of superconducting 1H TaS2 monolayers interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2 stems from amalgamation of the properties of adjacent 1H and 1T monolayers, where the former dominates the superconducting state and the latter the CDW behavior.

Original language	English
Journal	Nano Letters
Early online date	20 Jul 2022
DOIs	https://doi.org/10.1021/acs.nanolett.2c01851
Publication status	Published - 20 Jul 2022

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@article{4481c44eb6254e01b543959313a73e20,

title = "Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2",

abstract = "Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in nature. Unfortunately, this approach is currently limited to only a few layers that can be stacked on top of each other. Here we report a bulk vdW material consisting of superconducting 1H TaS2 monolayers interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2 stems from amalgamation of the properties of adjacent 1H and 1T monolayers, where the former dominates the superconducting state and the latter the CDW behavior.",

author = "Amritroop Achari and Jonas Bekaert and Vishnu Sreepal and Andrey Orekhov and Piranavan Kumaravadivel and Minsoo Kim and Nicolas Gauquelin and {Balakrishna Pillai}, Premlal and Johan Verbeeck and Peeters, {Francois M.} and Geim, {Andre K.} and Milo{\v s}evi{\'c}, {Milorad V.} and Nair, {Rahul R.}",

year = "2022",

month = jul,

day = "20",

doi = "10.1021/acs.nanolett.2c01851",

language = "English",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

}

TY - JOUR

T1 - Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2

AU - Achari, Amritroop

AU - Bekaert, Jonas

AU - Sreepal, Vishnu

AU - Orekhov, Andrey

AU - Kumaravadivel, Piranavan

AU - Kim, Minsoo

AU - Gauquelin, Nicolas

AU - Balakrishna Pillai, Premlal

AU - Verbeeck, Johan

AU - Peeters, Francois M.

AU - Geim, Andre K.

AU - Milošević, Milorad V.

AU - Nair, Rahul R.

PY - 2022/7/20

Y1 - 2022/7/20

N2 - Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in nature. Unfortunately, this approach is currently limited to only a few layers that can be stacked on top of each other. Here we report a bulk vdW material consisting of superconducting 1H TaS2 monolayers interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2 stems from amalgamation of the properties of adjacent 1H and 1T monolayers, where the former dominates the superconducting state and the latter the CDW behavior.

AB - Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in nature. Unfortunately, this approach is currently limited to only a few layers that can be stacked on top of each other. Here we report a bulk vdW material consisting of superconducting 1H TaS2 monolayers interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2 stems from amalgamation of the properties of adjacent 1H and 1T monolayers, where the former dominates the superconducting state and the latter the CDW behavior.

U2 - 10.1021/acs.nanolett.2c01851

DO - 10.1021/acs.nanolett.2c01851

M3 - Article

JO - Nano Letters

JF - Nano Letters

SN - 1530-6984

ER -

Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2

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