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• W2572921875 abstract "In order to establish the doping dependence of the critical current properties in the iron-based superconductors, the in-plane critical current density ${J}_{mathrm{c}}$ of $mathrm{BaF}{mathrm{e}}_{2}mathrm{A}{mathrm{s}}_{2}$-based superconductors $mathrm{B}{mathrm{a}}_{1ensuremath{-}x}{mathrm{K}}_{x}mathrm{F}{mathrm{e}}_{2}mathrm{A}{mathrm{s}}_{2}$ (K-Ba122), $mathrm{Ba}(mathrm{F}{mathrm{e}}_{1ensuremath{-}x}mathrm{C}{mathrm{o}}_{x}{)}_{2}mathrm{A}{mathrm{s}}_{2}$ (Co-Ba122), and $mathrm{BaF}{mathrm{e}}_{2}{(mathrm{A}{mathrm{s}}_{1ensuremath{-}x}{mathrm{P}}_{x})}_{2}$ (P-Ba122) in a wide range of doping concentration $x$ was investigated by means of magnetization hysteresis loop (MHL) measurements on single-crystal samples. Depending on the dopant elements and their concentration, ${J}_{mathrm{c}}$ exhibits a variety of magnetic-field $H$ and temperature $T$ dependences. (1) In the case of K-Ba122, the MHL of the underdoped samples $(xensuremath{le}0.33)$ exhibits a second magnetization peak (SMP), which sustains high ${J}_{mathrm{c}}$ at high $H$ and high $T$, exceeding ${10}^{5}mathrm{A}/mathrm{c}{mathrm{m}}^{2}$ at $T=25phantom{rule{4pt}{0ex}}mathrm{K}$ and ${ensuremath{mu}}_{0}H=6phantom{rule{4pt}{0ex}}mathrm{T}$ for $x=0.30$. On the other hand, the SMP is missing in the optimally $(xensuremath{sim}0.36--0.40)$ and overdoped $(xensuremath{sim}0.50)$ samples and consequently ${J}_{mathrm{c}}$ rapidly decreases by more than one order of magnitude, although the change in ${T}_{mathrm{c}}$ is within a few K. (2) For Co-Ba122, the SMP is always present over the entire superconducting (SC) dome from the underdoped $(xensuremath{sim}0.05)$ to the overdoped $(xensuremath{sim}0.12)$ region. However, the magnitude of ${J}_{mathrm{c}}$ significantly changes with $x$, exhibiting a sharp maximum at $xensuremath{sim}0.057$, which is a slightly underdoped composition for Co-Ba122. (3) For P-Ba122, the highest ${J}_{mathrm{c}}$ is attained at $x=0.30$, corresponding to the highest ${T}_{mathrm{c}}$ composition. For the overdoped samples, the MHL is characterized by a SMP located close to the irreversibility field ${H}_{mathrm{irr}}$. Common to the three doping variations, ${J}_{mathrm{c}}$ becomes highest at the underdoping side of the SC dome near the phase boundary between the SC phase and the antiferromagnetic-orthorhombic (AFO) phase. Also, the peak appears in a narrow range of doping, distinct from the ${T}_{mathrm{c}}$ dome with a broad maximum. These similarities in the three cases indicate that the observed doping dependence of ${J}_{mathrm{c}}$ is intrinsic to the $mathrm{BaF}{mathrm{e}}_{2}mathrm{A}{mathrm{s}}_{2}$-based superconductors. The scaling analysis of the normalized pinning force density ${f}_{mathrm{p}}$ as a function of the reduced magnetic field $h=H/{H}_{mathrm{irr}}$ shows that the peak position in the pinning force ${h}_{mathrm{max}}$ depends on $x$, indicating a change in pinning with $x$. On the other hand, $mathrm{high}text{ensuremath{-}}{J}_{mathrm{c}}$ samples always attain similar ${h}_{mathrm{max}}$ values of 0.40--0.45 for all the dopants, which may suggest that a common pinning source causes the highest ${J}_{mathrm{c}}$. A quantitative analysis of the $T$-dependent ${J}_{mathrm{c}}$ indicates that the two pinning mechanisms, namely, the spatial variations in ${T}_{mathrm{c}}$ (referred to as $ensuremath{delta}{T}_{mathrm{c}}$ pinning) and the fluctuations in the mean free path $(ensuremath{delta}l$ pinning), are enhanced for the underdoped samples, which results in the enhancement of ${J}_{mathrm{c}}$. Possible origins for the different pinning mechanism are discussed in connection with the $x$ dependence of ${T}_{mathrm{c}}$, the residual resistivity, AFO domain boundaries, and a possible quantum critical point." @default.
• W2572921875 created "2017-01-26" @default.
• W2572921875 creator A5005515931 @default.
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• W2572921875 creator A5089924920 @default.
• W2572921875 date "2017-01-23" @default.
• W2572921875 modified "2023-10-16" @default.
• W2572921875 title "Doping-dependent critical current properties in K, Co, and P-doped <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>BaF</mml:mi><mml:msub><mml:mi mathvariant=normal>e</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>A</mml:mi><mml:msub><mml:mi mathvariant=normal>s</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> single crystals" @default.
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