Tuning electronic ground states by using chemical pressure on quasi-two dimensional β″-(BEDT-TTF) 4 [(H 3 O)M(C 2 O 4 ) 3 ]·Y
Journal of Low Temperature Physics 142:3-4 (2006) 257-260
Abstract:
We report high-field magnetotransport studies on quasi-two dimensional β″-(BEDT-TTF) 4[(H 3O)M(C 2 O 4) 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 = C 6H 5NO 2 and C 6 H 5CN) to metallic (for smaller solvents, Y = C 5 H 5N and CH 2Cl 2). 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. © 2007 Springer Science+Business Media, Inc.A spin resonance investigation of magnetism and dynamics in the charge-transfer salts β″-(BEDT-TTF)4[(H3O)M(C2O4)3]S
Journal of Low Temperature Physics Springer Nature 142:3-4 (2006) 581-584
Tuning electronic ground states by using chemical pressure on quasi-two dimensionalβ″-(BEDT-TTF)4[(H3O)M(C2O4)3]·Y
Journal of Low Temperature Physics Springer Nature 142:3-4 (2006) 253-256
Tuning electronic ground states by using chemical pressure on quasi-two dimensional beta ''-(BEDT-TTF)(4)[(H3O)M(C2O4)(3)]center dot Y
J LOW TEMP PHYS 142:3-4 (2006) 253-256
Abstract:
We report high-field magnetotransport studies on quasi-two dimensional beta"-(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 CH2O2). These changes in the ground state are connected with modifications 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.Robust superconducting state in the low-quasiparticle-density organic metals β″-(BEDT-TTF)4[(H3O)M(C2O4)3]Y: Superconductivity due to proximity to a charge-ordered state
Physical Review B - Condensed Matter and Materials Physics 72:1 (2005)