title: Germanium Dumbbells in a New Superconducting Modification of BaGe3.
abstract: We report the high-pressure high-temperature synthesis (P = 15 GPa, T = 1300 K) of BaGe3(tI32) adopting a CaGe3-type crystal structure. Bonding analysis reveals layers of covalently bonded germanium dumbbells being involved in multicenter Ba-Ge interactions. Physical measurements evidence metal-type electrical conductivity and a transition to a superconducting state at 6.5 K. Chemical bonding and physical properties of the new modification are discussed in comparison to the earlier described hexagonal form BaGe3(hP8) with a columnar arrangement of Ge3 triangles.
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Rodrigo
authors.initials: R
authors.lastname: Castillo
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Alexey I
authors.initials: AI
authors.lastname: Baranov
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Burkhardt
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Raul
authors.initials: R
authors.lastname: Cardoso-Gil
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Walter
authors.initials: W
authors.lastname: Schnelle
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Matej
authors.initials: M
authors.lastname: Bobnar
authors.affiliation: Max-Planck-Institut für Chemische Physik fester Stoffe , Nöthnitzer Straße 40, 01187 Dresden, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schwarz