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The onset of magnetism peaked around x=1/4 in optimally electron-doped LnFe(1-x)Ru(x)AsO(1-y)F(y) (Ln = La, Nd or Sm) superconductors by Sanna, S.; Carretta, P.; De Renzi, R.; Prando, G.; Bonfà, P.; Mazzani, M.; Lamura, G.; Shiroka, T.; Kobayashi, Y.; Sato, M. is a scholarly article available to read on EtoBox.

What is The onset of magnetism peaked around x=1/4 in optimally electron-doped LnFe(1-x)Ru(x)AsO(1-y)F(y) (Ln = La, Nd or Sm) superconductors about?

The appearance of static magnetism, nanoscopically coexisting with superconductivity, is shown to be a general feature of optimally electron-doped LnFe(1-x)Ru(x)AsO(1-y)F(y) superconductor (Ln - lanthanide ion) upon isovalent substitution of Fe by Ru. The magnetic ordering temperature T_N and the magnitude of the internal field display a dome-like dependence on x, peaked around x=1/4, with higher T_N values for those materials characterized by a larger z cell coordinate of As. Remarkably, the latter are also those with the highest superconducting transition temperature (T_c) for x=0. The reduction of T_c(x) is found to be significant in the x region of the phase diagram where the static magnetism develops. Upon increasing the Ru content superconductivity eventually disappears, but only at x=0.6.

Author

Sanna, S.; Carretta, P.; De Renzi, R.; Prando, G.; Bonfà, P.; Mazzani, M.; Lamura, G.; Shiroka, T.; Kobayashi, Y.; Sato, M.

Published

2013

Language

EN