Tracking aluminium impurities in single crystals of the heavy-fermion 
superconductor UBe13

Amon, Alfred; Zelenina, Iryna; Simon, Paul; Bobnar, Matej; Naumann, Marcel; Svanidze, Eteri; Arnold, Frank; Borrmann, Horst; Burkhardt, Ulrich; Schnelle, Walter; Hassinger, Elena; Leithe-Jasper, Andreas; Grin, Yuri

doi:10.1038/s41598-018-28991-w

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Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe₁₃

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/persons/resource/persons214276

Amon, Alfred
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons224571

Zelenina, Iryna
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/persons146769

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

/persons/resource/persons195513

Naumann, Marcel
Physics of Unconventional Metals and Superconductors, 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/persons186147

Arnold, Frank
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126541

Borrmann, Horst
Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126556

Burkhardt, Ulrich
Ulrich Burkhardt, 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/persons186149

Hassinger, Elena
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126726

Leithe-Jasper, Andreas
Andreas Leithe-Jasper, 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;

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Citation

Amon, A., Zelenina, I., Simon, P., Bobnar, M., Naumann, M., Svanidze, E., et al. (2018). Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe₁₃. Scientific Reports, 8(1): 10654. doi:10.1038/s41598-018-28991-w.

Cite as: https://hdl.handle.net/21.11116/0000-0001-DFF5-0

Abstract

The influence of Al incorporation on the heavy fermion superconductor UBe13 was investigated to explain the sample dependence of physical properties. Clear evidence for incorporated Al in flux-grown UBe13 single crystals is presented by results from X-ray diffraction, nuclear magnetic resonance and X-ray spectroscopy. The increase of the lattice parameter and the concomitant change of the superconducting properties are caused by substitution of Be in the compound by 1–2 at.% Al. The minute amounts of Al in the structure were located by atomic resolution transmission electron microscopy. Specific heat measurements reveal the strong influence of incorporated Al on the physical properties of UBe13. Upon long-term annealing, Al incorporated in single crystals can leave the structure, restoring properties of Al-free polycrystalline UBe13.