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Abstract: The 18.5 K superconductor PuCoGa5 has many unusual properties, includingthose due to damage induced by self-irradiation. The superconducting transitiontemperature decreases sharply with time, suggesting a radiation-induced Frenkeldefect concentration much larger than predicted by current radiation damagetheories. Extended x-ray absorption fine-structure measurements demonstratethat while the local crystal structure in fresh material is well ordered, agedmaterial is disordered much more strongly than expected from simple defects,consistent with strong disorder throughout the damage cascade region. Thesedata highlight the potential impact of local lattice distortions relative todefects on the properties of irradiated materials and underscore the need formore atomic-resolution structural comparisons between radiation damageexperiments and theory.



Autor: C. H. Booth, E. D. Bauer, M. Daniel, R. E. Wilson, J. N. Mitchell, L. A. Morales, J. L. Sarrao, P. G. Allen

Fuente: https://arxiv.org/







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