New lithium- And ethylenediamine-intercalated superconductors Lix(C2H8N2)yWTe2

Masato Ono; Takashi Noji; Mimori Harada; Kazuki Sato; Takayuki Kawamata; Masatsune Kato

doi:10.7566/JPSJ.90.014706

New lithium- And ethylenediamine-intercalated superconductors Li_x(C₂H₈N₂)_yWTe₂

Masato Ono, Takashi Noji, Mimori Harada, Kazuki Sato, Takayuki Kawamata, Masatsune Kato

ENG - Applied Physics

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We have successfully synthesized new superconductors Li_x(C₂H₈N₂)_yWTe₂ with 0 < x(Li) < 2.0 via the co-intercalation of ethylenediamine (EDA) together with Li into WTe₂. It has been found that the maximum T_c = 3.8 K is shown at x(Li) = 0.5 in Li_x(C₂H₈N₂)_yWTe₂ and that only Li-intercalated samples of Li_xWTe₂ with x(Li) ≤ 0.5 show no superconductivity above 2 K. The emergence of superconductivity above 2 K requires the increase in the electronic density of states (EDOS) at the Fermi level (E_F) by the enhancement of the two-dimensionality due to the great expansion of the interlayer space between WTe₂ layers through the EDA-intercalation in addition to the electron-doping through the Li-intercalation. The increase in EDOS at E_F is supported by the increase in Pauli paramagnetic susceptibility. In addition, x(Li)-dependence of T_c can be also explained by the variation of EDOS at E_F.

Original language	English
Article number	014706
Journal	Journal of the Physical Society of Japan
Volume	90
Issue number	1
DOIs	https://doi.org/10.7566/JPSJ.90.014706
Publication status	Published - 2021 Jan 15

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title = "New lithium- And ethylenediamine-intercalated superconductors Lix(C2H8N2)yWTe2",

abstract = "We have successfully synthesized new superconductors Lix(C2H8N2)yWTe2 with 0 < x(Li) < 2.0 via the co-intercalation of ethylenediamine (EDA) together with Li into WTe2. It has been found that the maximum Tc = 3.8 K is shown at x(Li) = 0.5 in Lix(C2H8N2)yWTe2 and that only Li-intercalated samples of LixWTe2 with x(Li) ≤ 0.5 show no superconductivity above 2 K. The emergence of superconductivity above 2 K requires the increase in the electronic density of states (EDOS) at the Fermi level (EF) by the enhancement of the two-dimensionality due to the great expansion of the interlayer space between WTe2 layers through the EDA-intercalation in addition to the electron-doping through the Li-intercalation. The increase in EDOS at EF is supported by the increase in Pauli paramagnetic susceptibility. In addition, x(Li)-dependence of Tc can be also explained by the variation of EDOS at EF.",

author = "Masato Ono and Takashi Noji and Mimori Harada and Kazuki Sato and Takayuki Kawamata and Masatsune Kato",

note = "Funding Information: Acknowledgments This work was supported by JSPS KAKENHI (Grant Numbers 19K05241 and 20K14418). Publisher Copyright: {\textcopyright} 2021 The Physical Society of Japan",

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doi = "10.7566/JPSJ.90.014706",

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AU - Ono, Masato

AU - Noji, Takashi

AU - Harada, Mimori

AU - Sato, Kazuki

AU - Kawamata, Takayuki

AU - Kato, Masatsune

PY - 2021/1/15

Y1 - 2021/1/15

N2 - We have successfully synthesized new superconductors Lix(C2H8N2)yWTe2 with 0 < x(Li) < 2.0 via the co-intercalation of ethylenediamine (EDA) together with Li into WTe2. It has been found that the maximum Tc = 3.8 K is shown at x(Li) = 0.5 in Lix(C2H8N2)yWTe2 and that only Li-intercalated samples of LixWTe2 with x(Li) ≤ 0.5 show no superconductivity above 2 K. The emergence of superconductivity above 2 K requires the increase in the electronic density of states (EDOS) at the Fermi level (EF) by the enhancement of the two-dimensionality due to the great expansion of the interlayer space between WTe2 layers through the EDA-intercalation in addition to the electron-doping through the Li-intercalation. The increase in EDOS at EF is supported by the increase in Pauli paramagnetic susceptibility. In addition, x(Li)-dependence of Tc can be also explained by the variation of EDOS at EF.

AB - We have successfully synthesized new superconductors Lix(C2H8N2)yWTe2 with 0 < x(Li) < 2.0 via the co-intercalation of ethylenediamine (EDA) together with Li into WTe2. It has been found that the maximum Tc = 3.8 K is shown at x(Li) = 0.5 in Lix(C2H8N2)yWTe2 and that only Li-intercalated samples of LixWTe2 with x(Li) ≤ 0.5 show no superconductivity above 2 K. The emergence of superconductivity above 2 K requires the increase in the electronic density of states (EDOS) at the Fermi level (EF) by the enhancement of the two-dimensionality due to the great expansion of the interlayer space between WTe2 layers through the EDA-intercalation in addition to the electron-doping through the Li-intercalation. The increase in EDOS at EF is supported by the increase in Pauli paramagnetic susceptibility. In addition, x(Li)-dependence of Tc can be also explained by the variation of EDOS at EF.

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New lithium- And ethylenediamine-intercalated superconductors Li_x(C₂H₈N₂)_yWTe₂

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