Organic-ion-intercalated FeSe-based superconductors

M. Z. Shi; N. Z. Wang; B. Lei; C. Shang; F. B. Meng; L. K. Ma; F. X. Zhang; D. Z. Kuang; X. H. Chen

doi:10.1103/PhysRevMaterials.2.074801

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Organic-ion-intercalated FeSe-based superconductors

M. Z. Shi, N. Z. Wang, B. Lei, C. Shang, F. B. Meng, L. K. Ma, F. X. Zhang, D. Z. Kuang, X. H. Chen

DOI 10.1103/PhysRevMaterials.2.074801 · Physical Review Materials

T1

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Abstract

Finding a new derivative structure of FeSe-based superconductors with a high superconducting transition temperature (Tc) is of great significance. Here, in this work, an organic-ion-[cetyltrimethyl ammonium (CTA+)]-intercalated FeSe-based superconductor (CTA)0.3FeSe with Tc as high as 45 K is synthesized by an electrochemical intercalation method. The as-prepared (CTA)0.3FeSe has a hybrid crystal structure consisting of double layers of CTA+ and one layer of FeSe, which is consistent with a lateral-bilayer model. The superconductivity of (CTA)0.3FeSe is confirmed by magnetic susceptibility. Furthermore, a negative pressure effect on superconductivity dTc/dP=−5 K/GPa is observed. This is the first pure organic-ion-intercalated FeSe-based superconductor with a high Tc and high crystallinity. Our work offers a new method to modify the interface interaction between the FeSe layer and the intercalator, and sheds new light on finding new FeSe-based superconductors with higher Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(CTA)0.3FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	onset
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.9	Pressure unresolved	onset
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	36.7	8.9 GPa	unknown
Lix(NH3)yFe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown
Lix(C6H16N2)yFe2-zSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38	Pressure not reported	unknown
Lix(C2H8N2)yFe2-zSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	45	Pressure not reported	unknown
(Li0.8Fe0.2)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	65	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	48	Pressure not reported	unknown