New magnetic conductors and superconductors based on BEDT-TTF and BEDS-TTF

• Published in: Synthetic metals Vol. 154; no. 1; pp. 245 - 248
• Main Authors: Coronado, E., Curreli, S., Giménez-Saiz, C., Gómez-García, C.J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 22.09.2005; Amsterdam Elsevier Science; New York, NY
• Subjects: BEDS-TTF; BEDT-TTF; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Magnetic conductors; Magnetic superconductors; Organic superconductors; Physics; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Superconducting materials (excluding high-tc compounds); Superconductivity; Tris(oxalate)metallate complexes; Magnetic superconductors; BEDT-TTF; Magnetic conductors; BEDS-TTF; Tris(oxalate)metallate complexes; Chromium complexes; Organic superconductors; Electrical conductivity; Organic conductors; Superconducting transitions; Paramagnetism; magnetic conductors; Critical field; tris(oxalate)metallate complexes; Synthesis; Iron complexes; Crystal structure
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2005.07.061

Here we present our last results in the search for multifunctionality in conducting molecular materials obtained by combining paramagnetic molecular complexes with organic donors to produce paramagnetic molecular metals and superconductors. The structural and physical characterization of two new molecular paramagnetic superconductors ET 4[H 3OM(C 2O 4) 3].PhBr (M III = Cr and Fe) are presented (ET = BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene). These salts present a superconductor transition at T c = 1.5 and 4.0 K, respectively and very anisotropic critical fields H c2a ≈ H c2b ≈0.5 T and H C2C ≈ 8 T for the Fe derivative. We will also present the structural and physical characterization of two new metallic paramagnetic systems: ET 4[H 3OM(C 2O 4) 3].PhCl (M = Cr III and Fe III) and five different new semiconducting paramagnets obtained with the donor bis(ethylenediselena)tetrathiafulvalene (BEDS-TTF = BEST) and [M(C 2O 4) 3] 3− (M = Cr III and Fe III) complexes.