Temperature dependent synchrotron x-ray powder diffraction data on Ca0.82La0.18FeAs2 pnictide superconductor demonstrate anisotropic thermal expansion along the out-of-plane and in-plane lattice parameters. Thermal expansion along the c-axis shows a distinct change from 2.9 x 10(-4) angstrom K-1 at similar to 300 K to 1.0 x 10(-4) angstrom K-1 at similar to 110 K, whereas the in-plane axes, a and b, in the temperature range 300 to 100 K, show a constant thermal expansion that is an order of magnitude smaller (similar to 0.3x10(-4) angstrom K-1). The temperature dependence of the out-of-plane lattice parameter is found to have a good correlation with the behavior of the resistivity indicating the importance of the interlayer interaction in governing the transport properties of 112 pnictide superconductors.
Temperature dependent structural modulation in Ca0.82La0.18FeAs2 pnictide superconductors
Bernasconi, A;
2015-01-01
Abstract
Temperature dependent synchrotron x-ray powder diffraction data on Ca0.82La0.18FeAs2 pnictide superconductor demonstrate anisotropic thermal expansion along the out-of-plane and in-plane lattice parameters. Thermal expansion along the c-axis shows a distinct change from 2.9 x 10(-4) angstrom K-1 at similar to 300 K to 1.0 x 10(-4) angstrom K-1 at similar to 110 K, whereas the in-plane axes, a and b, in the temperature range 300 to 100 K, show a constant thermal expansion that is an order of magnitude smaller (similar to 0.3x10(-4) angstrom K-1). The temperature dependence of the out-of-plane lattice parameter is found to have a good correlation with the behavior of the resistivity indicating the importance of the interlayer interaction in governing the transport properties of 112 pnictide superconductors.
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