Large magnetic penetration depth and thermal fluctuations in a Ca$_{10}$(Pt$_{3}$As$_{8}$)[(Fe$_{1-x}$Pt$_{x}$)$_{2}$As$_{2}$]$_{5}$ (x=0.097) single crystal

Jeehoon Kim; Filip Ronning; N. Haberkorn; L. Civale; E. Nazaretski; Ni Ni; R. J. Cava; J. D. Thompson; R. Movshovich

doi:10.1103/PhysRevB.85.180504

paper

Large magnetic penetration depth and thermal fluctuations in a Ca $_{10}$ (Pt $_{3}$ As $_{8}$ )[(Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ] $_{5}$ (x=0.097) single crystal

arXiv:1205.5011 · doi:10.1103/PhysRevB.85.180504

Abstract

We have measured the temperature dependence of the absolute value of the magnetic penetration depth $λ (T)$ in a Ca $_{10}$ (Pt $_{3}$ As $_{8}$ )[(Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ] $_{5}$ (x=0.097) single crystal using a low-temperature magnetic force microscope (MFM). We obtain $λ_{ab}$ (0) $\approx$ 1000 nm via extrapolating the data to $T = 0$ . This large $λ$ and pronounced anisotropy in this system are responsible for large thermal fluctuations and the presence of a liquid vortex phase in this low-temperature superconductor with critical temperature of 11 K, consistent with the interpretation of the electrical transport data. The superconducting parameters obtained from $λ$ and coherence length $ξ$ place this compound in the extreme type \MakeUppercase{\romannumeral 2} regime. Meissner responses (via MFM) at different locations across the sample are similar to each other, indicating good homogeneity of the superconducting state on a sub-micron scale.

Large magnetic penetration depth and thermal fluctuations in a Ca $_{10}$ (Pt $_{3}$ As $_{8}$ )[(Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ] $_{5}$ (x=0.097) single crystal

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Large magnetic penetration depth and thermal fluctuations in a Ca10​(Pt3​As8​)[(Fe1−x​Ptx​)2​As2​]5​ (x=0.097) single crystal

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Large magnetic penetration depth and thermal fluctuations in a Ca $_{10}$ (Pt $_{3}$ As $_{8}$ )[(Fe $_{1 - x}$ Pt $_{x}$ ) $_{2}$ As $_{2}$ ] $_{5}$ (x=0.097) single crystal