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- W2920220966 abstract "Here we report on the structural and electronic phase diagram of lithium and ethylenediamine intercalated FeSe in a wide range of dopant concentration $(x=0ensuremath{sim}0.8)$. Undoped ${({mathrm{C}}_{2}{mathrm{H}}_{8}{mathrm{N}}_{2})}_{y}mathrm{F}{mathrm{e}}_{2}mathrm{S}{mathrm{e}}_{2}$ crystallizes in an orthorhombic phase. With increasing lithium doping, an orthorhombic to tetragonal phase transition occurs at $x=0.35$, and the superconducting tetragonal phase persists until $x=0.5$. Meanwhile, the ${T}_{c}$ is found dependent strongly on dopant concentration, raising rapidly from 30 K at $x=0.35$ to 45 K at $x=0.5$. The crystal structures of $mathrm{L}{mathrm{i}}_{0.31(3)}{({mathrm{C}}_{2}{mathrm{H}}_{8}{mathrm{N}}_{2})}_{0.52(7)}mathrm{F}{mathrm{e}}_{2.03(2)}mathrm{S}{mathrm{e}}_{2}$ are determined by using high-resolution neutron diffraction data at 5, 60, 150, and 295 K, respectively. The distortion of the FeSe tetrahedron is enhanced significantly from 150 to 295 K, meanwhile, the normal-state Hall resistivity changes sign from negative to positive in the same temperature range. The dominant hole carrier in electron-doped $mathrm{L}{mathrm{i}}_{0.5}{({mathrm{C}}_{2}{mathrm{H}}_{8}{mathrm{N}}_{2})}_{y}mathrm{F}{mathrm{e}}_{2}mathrm{S}{mathrm{e}}_{2}$ above 230 K suggests that the temperature-induced structure distortion may lead to a reconstruction of the Fermi surface topology and the appearance of hole pockets." @default.
- W2920220966 created "2019-03-11" @default.
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- W2920220966 date "2019-03-04" @default.
- W2920220966 modified "2023-10-18" @default.
- W2920220966 title "Structural evolution and phase diagram of the superconducting iron selenides Lix(C2H8N2)yFe2Se2(x=0∼0.8)" @default.
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- W2920220966 doi "https://doi.org/10.1103/physrevb.99.094503" @default.
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