Tetra-μ-acetato-κ8 O:O′-bis­{[2-methyl­sulfanyl-4-(pyridin-4-yl-κN)pyrimidine]­copper(II)}(Cu—Cu)

The binuclear title compound, [Cu2(CH3CO2)4(C10H9N3S)2], comprises a Cu2(CH3CO2)4 paddle-wheel core axially bound by two 2-methyl­sulfanyl-4-(pyridin-4-yl)pyrimidine ligands. The complex mol­ecule has an inversion center lying at the mid-point of the Cu—Cu bond

Transition of stoichiometricSr2VO3FeAs to a superconducting state at 37.2 K

The superconductor Sr4V2O6Fe2As2 with transition temperature at 37.2 K has been fabricated. It has a layered structure with the space group of p4/nmm, and with the lattice constants a = 3.9296Aand c = 15.6732A. The observed large diamagnetization signal and zero-resistance demonstrated the bulk superconductivity. The broadening of resistive transition was measured under different magnetic fields leading to the discovery of a rather high upper critical field. The results also suggest a large vortex liquid region which reflects high anisotropy of the system. The Hall effect measurements revealed dominantly electron-like charge carriers in this material. The superconductivity in the present system may be induced by oxygen deficiency or the multiple valence states of vanadium.Comment: 5 pages, 4 figure