The appearance of static magnetism, nanoscopically coexisting with superconductivity, is shown to be a general feature of optimally electron-doped LFe1−xRuxAsO1−yFy superconductors (L represents a lanthanide ion) upon isovalent substitution of Fe by Ru. The magnetic ordering temperature TN and the magnitude of the internal field display a domelike dependence on x, peaked around x=1/4, with higher TN values for those materials characterized by a larger z cell coordinate of As. Remarkably, the latter are also those with the highest superconducting transition temperatures (Tc) for x=0. The reduction of Tc(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.
The appearance of static magnetism, nanoscopically coexisting with superconductivity, is shown to be a general feature of optimally electron-doped LFe1-xRuxAsO1-yFy superconductors (L represents a lanthanide ion) upon isovalent substitution of Fe by Ru. The magnetic ordering temperature T-N and the magnitude of the internal field display a domelike 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 temperatures (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 similar or equal to 0.6. DOI: 10.1103/PhysRevB.87.134518
Onset of magnetism in optimally electron-doped LnFe1-xRuxAsO1-yFy (Ln = La, Nd or Sm) superconductors around x=1/4 / Sanna, S.; Carretta, P.; DE RENZI, Roberto; Prando, G.; Bonfa', Pietro; Mazzani, Marcello; Lamura, G.; Shiroka, T.; Kobayashi, Y.; Sato, M.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 87:13(2013), p. 134518. [10.1103/PhysRevB.87.134518]
Onset of magnetism in optimally electron-doped LnFe1-xRuxAsO1-yFy (Ln = La, Nd or Sm) superconductors around x=1/4
BONFA', Pietro;
2013
Abstract
The appearance of static magnetism, nanoscopically coexisting with superconductivity, is shown to be a general feature of optimally electron-doped LFe1-xRuxAsO1-yFy superconductors (L represents a lanthanide ion) upon isovalent substitution of Fe by Ru. The magnetic ordering temperature T-N and the magnitude of the internal field display a domelike 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 temperatures (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 similar or equal to 0.6. DOI: 10.1103/PhysRevB.87.134518
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