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.
Onset of magnetism in optimally electron-doped LFe1−xRuxAsO1− yFy (L= La, Nd, or Sm) superconductors around x=1/4 / Sanna, Samuele; Carretta, P.; De Renzi, R.; Prando, G.; Bonfà, P.; Mazzani, M.; Lamura, G.; Shiroka, T.; Kobayashi, Y.; Sato, M.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - STAMPA. - 87:(2013), pp. 134518.1-134518.6. [10.1103/PhysRevB.87.134518]
Onset of magnetism in optimally electron-doped LFe1−xRuxAsO1− yFy (L= La, Nd, or Sm) superconductors around x=1/4
SANNA, SAMUELE;
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 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.