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

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

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Zelenina,  Iryna
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Simon,  Paul
Paul Simon, 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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Naumann,  Marcel
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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

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

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

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

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Leithe-Jasper,  Andreas
Andreas Leithe-Jasper, 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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Zitation

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.


Zitierlink: https://hdl.handle.net/21.11116/0000-0001-DFF5-0
Zusammenfassung
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.