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Title: Critical current density and mechanism of vortex pinning in K xFe 2-ySe₂ doped with S

We report the critical current density J c in K xFe 2-ySe 2-zS z crystals. The J c can be enhanced significantly with optimal S doping (z=0.99). For K 0.70(7)Fe 1.55(7)Se 1.01(2)S 0.99(2), the weak fishtail effect is found for H II 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.
Authors:
;
Publication Date:
Type:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 5; Related Information: CHORUS Timestamp: 2017-04-06 04:13:44; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
OSTI Identifier:
1100554