Volume 91, Number 6, September 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||28 September 2010|
Single-crystal growth and superconducting properties of LiFeAs
CeNSCMR & Department of Physics and Astronomy, Seoul National University - Seoul 151-747, Republic of Korea
2 Department of Physics, University of Florida - Gainesville, FL 32611-8440, USA
Accepted: 10 September 2010
We report the successful growth of high-quality single crystals of LiFeAs with lateral sizes up to 5×5 mm2 by the Sn-flux method. Electrical resistivity studies reveal that the superconducting onset temperature is 18.2 K with a transition width less than 1.1 K and the ratio of room temperature to residual resistivity is about 24. Bulk superconductivity is supported by perfect shielding in the magnetic susceptibility and a clear jump in the specific heat Cp, resulting in ΔCp/T ≈ 20.0 mJ/mol K2. Upper-critical-field slopes of dHc2c/dT ≈−1.39 and dHc2ab/dT ≈−2.99 T/K near Tc predict zero-temperature upper critical fields of Hc2c(0) ≈ 17.2 and Hc2ab(0) ≈ 36.9 T and coherence lengths of ξab=4.4 and ξc=2.0 nm in a single-band model. This result points to a modest superconducting anisotropy about 2.3 in LiFeAs.
PACS: 74.70.Xa – Pnictides and chalcogenides / 74.25.F- – Transport properties / 74.25.-q – Properties of superconductors
© EPLA, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.