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

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

doi:10.1038/s41598-018-28991-w

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

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

Assistant Professorship of Quantum Matter - Experimental Solid State Physics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

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.

Original language	English
Article number	10654
Journal	Scientific Reports
Volume	8
Issue number	1
DOIs	https://doi.org/10.1038/s41598-018-28991-w
State	Published - 1 Dec 2018

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Amon, A., Zelenina, I., Simon, P., Bobnar, M., Naumann, M., Svanidze, E., Arnold, F., Borrmann, H., Burkhardt, U., Schnelle, W., Hassinger, E., Leithe-Jasper, A., & Grin, Y. (2018). Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe₁₃ Scientific Reports, 8(1), Article 10654. https://doi.org/10.1038/s41598-018-28991-w

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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.",

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AU - Zelenina, Iryna

AU - Simon, Paul

AU - Bobnar, Matej

AU - Naumann, Marcel

AU - Svanidze, Eteri

AU - Arnold, Frank

AU - Borrmann, Horst

AU - Burkhardt, Ulrich

AU - Schnelle, Walter

AU - Hassinger, Elena

AU - Leithe-Jasper, Andreas

AU - Grin, Yuri

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N2 - 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.

AB - 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.

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

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