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Trigermanides AEGe3 (AE = Ca, Sr, Ba): chemical bonding and superconductivity

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

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Schnelle,  Walter
Walter Schnelle, Inorganic Chemistry, 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;

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

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

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

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Grin,  Yuri
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;
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Citation

Castillo, R., Schnelle, W., Baranov, A. I., Burkhardt, U., Bobnar, M., Cardoso-Gil, R., et al. (2016). Trigermanides AEGe3 (AE = Ca, Sr, Ba): chemical bonding and superconductivity. Zeitschrift für Naturforschung, B: A Journal of Chemical Sciences, 71(5), 585-592. doi:10.1515/znb-2016-0047.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-D770-6
Abstract
The crystal structures of the trigermanides AEGe(3) (tI32) (AE = Ca, Sr, Ba; space group I4/mmm, for SrGe3 : a = 7.7873(1), c = 12.0622(3)angstrom) comprise Ge-2 dumbbells forming layered Ge substructures which enclose embedded AE atoms. The chemical bonding analysis by application of the electron localizability approach reveals a substantial charge transfer from the AE atoms to the germanium substructure. The bonding within the dumbbells is of the covalent two-center type. A detailed analysis of SrGe3 reveals that the interaction on the bond-opposite side of the Ge-2 groups is not lone pair-like-as it would be expected from the Zintl-like interpretation of the crystal structure with anionic Ge layers separated by alkaline-earth cations-but multi-center strongly polar between the Ge-2 dumbbells and the adjacent metal atoms. Similar atomic interactions are present in CaGe3 and BaGe3. The variation of the alkaline-earth metal has a merely insignificant influence on the superconducting transition temperatures in the s,p-electron compounds AEGe(3).