Critical current density and mechanism of vortex pinning in K x Fe 2-y Se 2 doped with S

Lei, Hechang; Petrovic, C.

doi:10.1103/PhysRevB.84.052507

Critical current density and mechanism of vortex pinning in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$ doped with S

Journal Article · Mon Aug 01 04:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.84.052507· OSTI ID:1385597

Lei, Hechang; Petrovic, C.

We report the critical current density J c in K x Fe 2 - y Se 2 - z S 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 ∥ 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.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385597

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 5 Vol. 84; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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