| Autor: |
Likhanov MS; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Verchenko VY; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.; National Institute of Chemical Physics and Biophysics, 12618 Tallinn, Estonia., Zhupanov VO; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia., Wei Z; Department of Chemistry, University at Albany, SUNY, Albany, New York 12222, United States., Dikarev EV; Department of Chemistry, University at Albany, SUNY, Albany, New York 12222, United States., Kuznetsov AN; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.; N. S. Kurnakov Institute of General and Inorganic Chemistry RAS, 119991 Moscow, Russia., Shevelkov AV; Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia. |
| Abstrakt: |
Transition metal-based endohedral cluster intermetallic compounds are interesting electron phases, which frequently exhibit superconductivity with a peculiar interplay between the critical temperature and valence electron count. We present a new Re-based endohedral gallium cluster compound, Re 2 Ga 9 Ge. Its unique crystal structure ( P 4 2 /mmc space group, a = 8.0452(3) Å, c = 6.7132(2) Å) is built by two types of gallium polyhedra: monocapped Archimedean antiprisms centered by rhenium atoms and tetrahedra containing a main-group element inside. The analysis of chemical bonding shows the presence of localized pairwise interactions between the p -block elements and the formation of multicenter bonds with the participation of d -orbitals of rhenium. In the electronic band structure, the Fermi level is located in a narrow pseudogap indicating the optimum band filling and thus explaining the virtual absence of a homogeneity range. The compound exhibits Pauli paramagnetism and metallic properties with unexpectedly low thermal conductivity. A sharp anomaly observed on the magnetic susceptibility and resistivity curves presumably indicates the electronic phase transition accompanied by charge ordering at the characteristic temperature of T * = 271 K in zero magnetic field. |
