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

The influence of Al incorporation on the heavy fermion superconductor UBe 13 was investigated to explain the sample dependence of physical properties. Clear evidence for incorporated Al in flux-grown UBe 13 single crystals is presented by results from X-ray diffraction, nuclear magnetic resonance an...

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Published in:Scientific reports 2018-07, Vol.8 (1), p.1-10, Article 10654
Main Authors: 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
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Zelenina, Iryna
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Bobnar, Matej
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Schnelle, Walter
Hassinger, Elena
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description The influence of Al incorporation on the heavy fermion superconductor UBe 13 was investigated to explain the sample dependence of physical properties. Clear evidence for incorporated Al in flux-grown UBe 13 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 UBe 13 . Upon long-term annealing, Al incorporated in single crystals can leave the structure, restoring properties of Al-free polycrystalline UBe 13 .
doi_str_mv 10.1038/s41598-018-28991-w
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subjects 140/131
639/301/119/1003
639/638/298/924
639/766/119/1003
Aluminum
Crystals
Humanities and Social Sciences
Impurities
multidisciplinary
NMR
Nuclear magnetic resonance
Physical properties
Science
Science (multidisciplinary)
Single crystals
Specific heat
Transmission electron microscopy
X-ray diffraction
X-ray spectroscopy
title Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe13
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