Superconductivity and intercalation state in the lithium-hexamethylenediamine-intercalated superconductor Lix(C6H16N2)yFe2-zSe2: Dependence on the intercalation temperature and lithium content

Shohei Hosono, Takashi Noji, Takehiro Hatakeda, Takayuki Kawamata, Masatsune Kato, Yoji Koike

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10 Citations (Scopus)

Abstract

The superconductivity and intercalation state in the lithium- and hexamethylenediamine (HMDA)-intercalated superconductor Lix(C6H16N2)yFe2-zSe2 have been investigated from powder x-ray diffraction, thermogravimetric, and magnetic susceptibility measurements, changing the intercalation temperature Ti and the Li content x. Both Li and HMDA have been co-intercalated stably up to x = 2 roughly in a molar ratio of x : y = 2 : 1. In the case of Ti = 45°C, it has been found that both Li and HMDA are co-intercalated locally at the edge of FeSe crystals, indicating that both Li and HMDA are hard to diffuse into the inside of FeSe crystals at 45°C. In the case of Ti = 100°C, on the other hand, it has been found that both Li and HMDA diffuse into the inside of FeSe crystals, so that Tc tends to increase with increasing x from ∼30 K at x = 1 up to 38 K at x = 2 owing to the increase in the number of electron carriers doped from Li into the FeSe layers.

Original languageEnglish
Article number104701
Journaljournal of the physical society of japan
Volume85
Issue number10
DOIs
Publication statusPublished - 2016 Oct 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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