Tuning Electronic Ground States by Using Chemical Pressure on Quasi-Two Dimensional β′′-(BEDT-TTF)4[(H3O)M(C2O4)3]·Y
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We report high-field magnetotransport studies on quasi-two dimensional β′′-(BEDT-TTF)4[(H3O)M(C2O4)3]· Y where Y is a solvent in the anionic layer. By changing the size of the solvent the low temperatures electronic behaviour varies from superconducting (for larger solvents, Y = C6H5NO2 and C6H5CN) to metallic (for smaller solvents, Y = C5H5N and CH2Cl2). These changes in the ground state are connected with modications of the Fermi surface, which varies from having one or two pockets for the superconducting charge- transfer salts to at least four pockets in the case of metallic ones. When superconducting, the materials have very large in-plane critical fields (up to 32 T) and enhanced effective masses compared with the metallic compounds. The role of the charge-order fluctuations in stabilizing the superconducting ground state and the effects of intrinsic local disorder is discussed.
PACS numbers74.10.+v 71.18.+y 71.20.Rv 72.15.Gd
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