Lower Critical Field, Anisotropy, and Two-Gap Features of LiFeAs
K. Sasmal (1), B. Lv (2), Z. Tang (2), F. Y. Wei (1), Y. Y. Xue (1),, A. M. Guloy (2), and C. W. Chu (1, 3, 4) ((1) Department of Physics and, TCSUH, University of Houston, Houston TX, (2) Department of Chemistry and, TCSUH, University of Houston, Houston TX, (3) LBNL
TL;DR
This study investigates the magnetic properties of LiFeAs, revealing its near-isotropic lower critical field, two-gap superconductivity features, and consistent parameters across single and polycrystalline samples.
Contribution
It provides new insights into the anisotropy and two-gap features of LiFeAs, supported by comprehensive experimental data from both single and polycrystalline samples.
Findings
Lower critical field is nearly isotropic with temperature dependence similar to two-gap superconductors.
Parameters from polycrystalline samples agree with single crystal data.
LiFeAs exhibits two-gap superconductivity features.
Abstract
The magnetic properties of LiFeAs, as single crystalline and polycrystalline samples, were investigated. The lower critical field deduced from the vortex penetration of two single crystals appears to be almost isotropic with a temperature dependence closer to that of two-gap superconductors. The parameters extracted from the reversible magnetizations of sintered polycrystalline samples are in good agreement with those from the single crystal data.
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