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

被引：26

作者：

Prando, G. ^{[2
,3
]}

Carretta, P. ^{[2
]}

De Renzi, R. ^{[4
]}

Sanna, S. ^{[2
]}

Grafe, H-J. ^{[1
]}

Wurmehl, S. ^{[1
]}

Buechner, B. ^{[1
]}

机构：

[1] Leibniz IFW Dresden, D-01171 Dresden, Germany

[2] Univ Pavia, CNISM, Dep Phys A Volta, I-27100 Pavia, Italy

[3] Univ Roma Tre, CNISM, Dept Phys E Amaldi, I-00146 Rome, Italy

[4] Univ Parma, CNISM, Dept Phys, I-43124 Parma, Italy

来源：

PHYSICAL REVIEW B | 2012年 / 85卷 / 14期

关键词：

HIGH-TEMPERATURE SUPERCONDUCTORS; CU-O CRYSTAL; FLUX-CREEP; DEPENDENCE; MOTION;

D O I：

10.1103/PhysRevB.85.144522

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 T-c 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 U-0 exhibits a common trend for all the samples with a typical crossover field value (2500 Oe less than or similar to H-cr less than or similar to 5000 Oe) separating regions where single and collective depinning processes are at work.

引用

页数：9

共 42 条

[1] VORTICES IN HIGH-TEMPERATURE SUPERCONDUCTORS [J].