Ac susceptibility and static magnetization measurements were performed in the nearly optimally doped LaFeAsO0.9F0.1 and CeFeAsO0.92F0.08 superconductors, complementing earlier results on SmFeAsO0.8F0.2 [ Phys. Rev. B 83 174514 (2011)]. The magnetic field-temperature phase diagram of the mixed superconducting state is drawn for the three materials, displaying a sizable reduction of the liquid phase upon increasing Tc in the range of applied fields (H⩽5 T). This result indicates that SmFeAsO0.8F0.2 is the most interesting compound among the investigated ones in view of possible applications. The field-dependence of the intragrain depinning energy U0 exhibits a common trend for all the samples with a typical crossover field value (2500 Oe ≲Hcr≲5000 Oe) separating regions where single and collective depinning processes are at work.

ac susceptibility investigation of vortex dynamics in nearly optimally doped RFeAsO1−xFx superconductors (R = La, Ce, Sm) / G., Prando; P., Carretta; DE RENZI, Roberto; S., Sanna; H. J., Grafe; S., Wurmehl; B., Büchner. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 85:(2012), pp. 144522-1-144522-9. [10.1103/PhysRevB.85.144522]

ac susceptibility investigation of vortex dynamics in nearly optimally doped RFeAsO1−xFx superconductors (R = La, Ce, Sm)

DE RENZI, Roberto;
2012-01-01

Abstract

Ac susceptibility and static magnetization measurements were performed in the nearly optimally doped LaFeAsO0.9F0.1 and CeFeAsO0.92F0.08 superconductors, complementing earlier results on SmFeAsO0.8F0.2 [ Phys. Rev. B 83 174514 (2011)]. The magnetic field-temperature phase diagram of the mixed superconducting state is drawn for the three materials, displaying a sizable reduction of the liquid phase upon increasing Tc in the range of applied fields (H⩽5 T). This result indicates that SmFeAsO0.8F0.2 is the most interesting compound among the investigated ones in view of possible applications. The field-dependence of the intragrain depinning energy U0 exhibits a common trend for all the samples with a typical crossover field value (2500 Oe ≲Hcr≲5000 Oe) separating regions where single and collective depinning processes are at work.
2012
ac susceptibility investigation of vortex dynamics in nearly optimally doped RFeAsO1−xFx superconductors (R = La, Ce, Sm) / G., Prando; P., Carretta; DE RENZI, Roberto; S., Sanna; H. J., Grafe; S., Wurmehl; B., Büchner. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 85:(2012), pp. 144522-1-144522-9. [10.1103/PhysRevB.85.144522]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2428435
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