Rare earth substitution in lattice-tuned Sr0.3Ca0.7Fe2As2solid solutions

Tyler Drye, Shanta Saha, Johnpierre Paglione, Peter Y. Zavalij

Type: Article

Publication Date: 2012-07-17

Citations: 1

DOI: https://doi.org/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.

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Rare earth substitution in lattice-tuned Sr<sub>0.3</sub>Ca<sub>0.7</sub>Fe<sub>2</sub>As<sub>2</sub>solid solutions

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