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Large magnetic penetration depth and thermal fluctuations in a superconducting Ca (Pt As )[(Fe Pt ) As ] ( ) single crystal

Author(s): Kim, Jeehoon; Ronning, Filip; Haberkorn, N.; Civale, Leonardo; Nazaretski, E.; et al

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Abstract: We have measured the temperature dependence of the absolute value of the magnetic penetration depth λ(T) in a Ca 10(Pt 3As 8)[(Fe 1-xPt x) 2As 2] 5 (x=0.097) single crystal using a low-temperature magnetic force microscope (MFM). We obtain λ ab(0)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 a 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 II 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 submicron scale. © 2012 American Physical Society.
Publication Date: May-2012
Electronic Publication Date: 18-May-2012
Citation: Kim, Jeehoon, Ronning, Filip, Haberkorn, N., Civale, L., Nazaretski, E., Ni, Ni, Cava, R.J., Thompson, J.D., Movshovich, R. (2012). Large magnetic penetration depth and thermal fluctuations in a superconducting Ca (Pt As )[(Fe Pt ) As ] ( ) single crystal. Physical Review B, 85 (18), 10.1103/PhysRevB.85.180504
DOI: doi:10.1103/PhysRevB.85.180504
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 85.18:180504-1 - 180504-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. This is an open access article.
Notes: Physical Review B - Condensed Matter and Materials Physics. Volume 85, Issue 18, 18 May 2012, Article number 180504.

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