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

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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number014706
Journaljournal of the physical society of japan
Volume90
Issue number1
DOIs
Publication statusPublished - 2021 Jan 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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