Magnetic phase diagram of cubic perovskites SrMn_1-xFe_xO_3

TL;DR

This study constructs the magnetic phase diagram of SrMn_1-xFe_xO_3 cubic perovskites, revealing antiferromagnetic, spin-glass, and coexistence phases influenced by Fe substitution levels.

Contribution

It provides the first comprehensive magnetic phase diagram of SrMn_1-xFe_xO_3, combining multiple experimental techniques to elucidate magnetic behaviors and interactions.

Findings

Antiferromagnetic order in lightly and heavily Fe-substituted samples

Spin-glass behavior at intermediate Fe levels

Coexistence of magnetic phases near x=0.5

Abstract

We combine the results of magnetic and transport measurements with Mossbauer spectroscopy and room-temperature diffraction data to construct the magnetic phase diagram of the new family of cubic perovskite manganites SrMn_1-xFe_xO_3. We have found antiferromagnetic ordering for lightly and heavily Fe-substituted material, while intermediate substitution leads to spin-glass behavior. Near the SrMn_0.5Fe_0.5O_3 composition these two types of ordering are found to coexist and affect one another. The spin glass behavior may be caused by competing ferro- and antiferromagnetic interactions among Mn^4+ and observed Fe^3+ and Fe^5+ ions.