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Critical current density and mechanism of vortex pinning in KxFe2-ySe2 doped with S

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arxiv 1104.0242 v2 pith:ONUVQECS submitted 2011-04-01 cond-mat.supr-con cond-mat.mtrl-sci

Critical current density and mechanism of vortex pinning in KxFe2-ySe2 doped with S

Hechang Lei , C. Petrovic This is my paper
classification cond-mat.supr-con cond-mat.mtrl-sci
keywords pinningvortexcriticalcurrentdensitymechanismcrystalsdefects
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report the critical current density Jc in KxFe2-ySe2-zSz crystals. The Jc can be enhanced significantly with optimal S doping (z=0.99). For K0.70(7)Fe1.55(7)Se1.01(2)S0.99(2), the weak fishtail effect is found for H||c. The normalized vortex pinning forces follow the scaling law with a maximum position at 0.41 of the reduced magnetic field. These results demonstrate that the small size normal point defects dominate the vortex pinning mechanism.

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