Germanium Dumbbells in a New Superconducting Modification of BaGe3

Castillo, Rodrigo; Baranov, Alexey I.; Burkhardt, Ulrich; Cardoso-Gil, Raul; Schnelle, Walter; Bobnar, Matej; Schwarz, Ulrich

doi:10.1021/acs.inorgchem.6b00299

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Germanium Dumbbells in a New Superconducting Modification of BaGe₃

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Castillo, Rodrigo
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baranov, Alexey I.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Burkhardt, Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126561

Cardoso-Gil, Raul
Raul Cardoso, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126838

Schnelle, Walter
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bobnar, Matej
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126841

Schwarz, Ulrich
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Castillo, R., Baranov, A. I., Burkhardt, U., Cardoso-Gil, R., Schnelle, W., Bobnar, M., et al. (2016). Germanium Dumbbells in a New Superconducting Modification of BaGe₃. Inorganic Chemistry, 55(9), 4498-4503. doi:10.1021/acs.inorgchem.6b00299.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-F846-4

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.