In-Cage Interactions in the Clathrate Superconductor Sr8Si46

Hübner, Julia-Maria; Prots, Yurii; Schnelle, Walter; Bobnar, Matej; König, Markus; Baitinger, Michael; Simon, Paul; Carrillo-Cabrera, Wilder; Ormeci, Alim; Svanidze, Eteri; Grin, Yuri; Schwarz, Ulrich

doi:10.1002/chem.201904170

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In-Cage Interactions in the Clathrate Superconductor Sr₈Si₄₆

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Hübner, Julia-Maria
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126806

Prots, Yurii
Yuri Prots, 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;

/persons/resource/persons146769

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

/persons/resource/persons126702

König, Markus
Markus König, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126529

Baitinger, Michael
Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126855

Simon, Paul
Paul Simon, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126563

Carrillo-Cabrera, Wilder
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126787

Ormeci, Alim
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons206323

Svanidze, Eteri
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126626

Grin, Yuri
Juri Grin, 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

Hübner, J.-M., Prots, Y., Schnelle, W., Bobnar, M., König, M., Baitinger, M., et al. (2020). In-Cage Interactions in the Clathrate Superconductor Sr₈Si₄₆. Chemistry – A European Journal, 26(4), 830-838. doi:10.1002/chem.201904170.

Cite as: https://hdl.handle.net/21.11116/0000-0005-69D9-1

Abstract

The clathrate I superconductor Sr8Si46 is obtained under high-pressure high-temperature conditions, at 5 GPa and temperatures in the range of 1273 to 1373 K. At ambient pressure, the compound decomposes upon heating at T= 796(5) K into Si and SrSi2. The crystal structure of the clathrate is isotypic to that of Na8Si46. Chemical bonding analysis reveals conventional covalent bonding within the silicon network as well as additional multi-atomic interactions between Sr and Si within the framework cages. Physical measurements indicate a bulk BCS type II superconducting state below T-c= 3.8(3) K.