Critical fields and vortex pinning in overdoped Ba0.2K0.8Fe2As2

Shen, B.; Leroux, M.; Wang, Y. L.; Luo, X.; Vlasko-Vlasov, V. K.; Koshelev, A. E.; Xiao, Z. L.; Welp, U.; Kwok, W. K.; Smylie, M. P.; Snezhko, A.; Metlushko, V.

doi:10.1103/PhysRevB.91.174512

Title: Critical fields and vortex pinning in overdoped ${Ba}_{0.2} K_{0.8} {Fe}_{2} {As}_{2}$

Journal Article · Tue May 19 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.174512· OSTI ID:1356359

Shen, B. ^[1]; Leroux, M. ^[1]; Wang, Y. L. ^[1]; Luo, X. ^[1]; Vlasko-Vlasov, V. K. ^[1]; Koshelev, A. E. ^[1]; Xiao, Z. L. ^[1]; Welp, U. ^[1]; Kwok, W. K. ^[1]; Smylie, M. P. ^[1]; Snezhko, A. ^[1]; Metlushko, V. ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Illinois, Chicago, IL (United States)

We determine the upper and lower critical fields, the penetration depth and the vortex pinning characteristics of single crystals of overdoped Ba_0.2K_0.8Fe₂As₂ with T_c ~ 10 K. We find that bulk vortex pinning is weak and vortex dynamics to be dominated by the geometrical surface barrier. The temperature dependence of the lower critical field, H_c1, displays a distinctive upturn at low temperatures, which is suggestive of two distinct superconducting gaps. Furthermore, the penetration depth, λ, varies linearly with temperature below 4 K indicative of line nodes in the superconducting gap. As a result, these observations can be well described in a model based on a multi-band nodal superconducting gap.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1356359

Alternate ID(s):: OSTI ID: 1182335

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 17; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Upper critical field in dirty two-band superconductors: Breakdown of the anisotropic Ginzburg-Landau theory Golubov, A. A.; Koshelev, A. E. Physical Review B, Vol. 68, Issue 10 https://doi.org/10.1103/PhysRevB.68.104503	journal	September 2003

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Thermal post processing of FeSe _{1− x} Te _x : formation of surface iron oxides and enhancement of J _c Uhrig, David M.; Williams, Grant V. M.; Bioletti, Gabriel Superconductor Science and Technology, Vol. 32, Issue 7 https://doi.org/10.1088/1361-6668/ab167e	journal	May 2019
Superconductivity, pairing symmetry, and disorder in the doped topological insulator ${Sn}_{1 - x} {In}_{x} Te$ for $x \geq 0.10$ Smylie, M. P.; Claus, H.; Kwok, W. -K. Physical Review B, Vol. 97, Issue 2 https://doi.org/10.1103/physrevb.97.024511	journal	January 2018

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
phonons
thermal conductivity
energy storage (including batteries and capacitors)
superconductivity
defects
spin dynamics

Title: Critical fields and vortex pinning in overdoped Ba 0.2 K 0.8 Fe 2 As 2

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Title: Critical fields and vortex pinning in overdoped ${Ba}_{0.2} K_{0.8} {Fe}_{2} {As}_{2}$