Extreme anisotropy and anomalous transport properties of heavily electron doped Lix(NH3)yFe2Se2 single crystals

Abstract

The missing hole packets near the Brillouin zone center render unique electronic structures to the heavily electron doped FeSe-based superconductors with Tc above 40 K. It challenges the existing scenario accounting for the nature of superconductivity in the iron-based family. Yet, one hurdle that has to be overcome is the materials complexity in the rather limited number of compounds. Here we report the growth of heavily electron doped Li-NH3 intercalated FeSe single crystals that are free of such complexities and allow access to the intrinsic superconducting properties. Our results show extremely large electronic anisotropy in both normal and superconducting states. Moreover, the anomalous transport properties appear in normal state, which are believed related to the anisotropy of relaxation time and/or temperature dependent electron carrier concentration. In view of the great chemical flexibility of intercalants, our findings provide novel platform to understanding of superconductivity origin of FeSe-related superconductors.

arXiv comment8 pages, 5 figures

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Cited by in corpus (16)

• Discrete superconducting phases in FeSe-derived superconductors
• Resilient nodeless $d$-wave superconductivity in monolayer FeSe
• Protonation induced high-Tc phases in iron-based superconductors evidenced by NMR and magnetization measurements
• High-Tc superconductivity up to 55 K under high pressure in the heavily electron doped Lix(NH3)yFe2Se2 single crystal
• Giant anisotropy in superconducting single crystals of CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Protonation-induced discrete superconducting phases in bulk FeSe single crystals
• Anisotropic physical properties and large critical current density in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ single crystal
• Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2
• Significant enhancement of critical current density in H+-intercalated FeSe single crystal
• Probing the direct factor for superconductivity in FeSe-Based Superconductors by Raman Scattering
• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure
• Enhanced superconductivity and anisotropy of FeTe0.6Se0.4 single crystals with Li-NH3 intercalation
• A disorder-sensitive emergent vortex phase identified in high-Tc superconductor (Li,Fe)OHFeSe
• Transport properties of Lix(NH3)yFe2(TezSe1-z)2 single crystals in the mixed state
• Crystal structures and the sign reversal Hall resistivity in iron-based superconductors Lix(C3H10N2)0.32FeSe (0.15<x<0.4)
• Superconductivity of 30.4 K and its Reemergence under Pressure in Fe1.11Se Synthesized via Ion-exchange and De-intercalation Reaction