Rare earth substitution in lattice-tuned Sr0.3Ca0.7Fe2As2 solid solutions
Tyler Drye, Shanta R. Saha, Peter Y. Zavalij, and Johnpierre Paglione
TL;DR
This study investigates how substituting rare earth elements like La into Sr0.3Ca0.7Fe2As2 affects its magnetic and structural properties, revealing that La suppresses antiferromagnetic order but does not induce superconductivity.
Contribution
It provides new insights into the effects of rare earth substitution on magnetic ordering and phase behavior in Sr-Ca-Fe-As compounds, highlighting differences from related systems.
Findings
La substitution reduces antiferromagnetic transition temperature from 200 K to 100 K.
Magnetic order persists despite 30% La substitution.
No superconductivity observed above 10 K with La doping.
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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