Rare earth substitution in lattice-tuned Sr0.3Ca0.7Fe2As2 solid solutions
arXiv:1204.1335 · doi:10.1088/0953-2048/25/8/084014
Abstract
The effects of aliovalent rare earth substitution on the physical properties of Sr0.3Ca0.7Fe2As2 solid solutions are explored. Electrical transport, magnetic susceptibility and structural characterization data as a function of La substitution into (Sr_1-y_Ca_y)_1-x_La_x_Fe2As2 single crystals confirm the ability to suppress the antiferromagnetic ordering temperature from 200 K in the undoped compound down to 100 K approaching the solubility limit of La. Despite up to ~30% La substitution, the persistence of magnetic order and lack of any signature of superconductivity above 10 K present a contrasting phase diagram to that of Ca1-xLaxFe2As2, indicating that the suppression of magnetic order is necessary to induce the high-temperature superconducting phase observed in Ca1-xLaxFe2As2.
Submitted to Superconductor Science and Technology focus issue: "Fe-based superconductors: materials, theory, experiment and applications (Iron 12)"
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