Structural and Magnetic Properties of Co1-xFexSr2YCu2O7 compounds

TL;DR

This study investigates how substituting Fe for Co in CoSr2YCu2O7 alters its crystal structure and magnetic properties, revealing structural phase transitions and mixed valence states without superconductivity.

Contribution

It provides new insights into the structural and magnetic evolution of Co1-xFexSr2YCu2O7 compounds with varying Fe content, highlighting phase changes and valence states.

Findings

Fe substitution induces a change from orthorhombic to tetragonal structure.

Both Co and Fe ions are in mixed valence states.

No superconductivity observed in synthesized samples.

Abstract

Here we study the structural and magnetic properties of the CoFeSr2YCu2O7 compound with x = 0.0 to 1.0. X-ray diffraction patterns and simulated data obtained from Rietveld refinement of the same indicate that the iron ion replacement in CoFeSr2YCu2O7 induces a change in crystal structure. The orthorhombic Ima2 space group structure of Co-1212 changes to tetragonal P4/mmm with increasing Fe ion. The XPS studies reveal that both Co and Fe ions are in mixed states for the former and in case of later.Although none of the studied as synthesized samples in CoFeSr2YCu2O7 are superconducting, the interesting structural changes in terms of their crystallisation space groups and the weak magnetism highlights the rich solid state chemistry of this class of materials.