Abstract
The temperature dependent structural studies carried out on the spin-correlated system A2FeCoO6 (A= Sm, Eu, Dy and Ho) or AFCO (A= Sm, E, D and H), using synchrotron radiation is presented. Owing to the large absorption cross-sections of the rare earths; Eu, Sm and Dy for neutrons, synchrotron radiation is one of the best available candidates for probing the system. The perovskite phase formation is inferred from laboratory XRD with Cu Kα source. The temperature dependent synchrotron X-ray diffraction (SXRD) experiments show the coexistence of monoclinic P21/n and orthorhombic Pbnm phases in Ho and Dy, while Eu and Sm are formed in single phase Pbnm. The temperature dependent DC magnetization measurements infer the presence of many interesting features such as thermal hysteresis, magnetic irreversibility, spin re-orientation, re-entrant magnetization and negative magnetization.
Highlights
Magnetic double perovskite (DP) materials of the form A2BB O6 (A: an alkaline earth or rare earth cation, B, B : transition metal cation) widely find applications as sensors, refrigerants etc
One of the well-studied double perovskites, Sr2FeMoO6 (SFMO) has shown very high magnetoresistance (MR) above room temperature, which turned out to be the motive force for the search for other DP systems.[1]
The orthorhombic Pbnm space group was revealed from room temperature XRD measurements
Summary
Magnetic double perovskite (DP) materials of the form A2BB O6 (A: an alkaline earth or rare earth cation, B, B : transition metal cation) widely find applications as sensors, refrigerants etc. The ASD can control the response of the material to the applied stimuli.[2] When B - site disorder is present in a magnetic material, it can lead to lattice or spin frustrations. This results in the reduction of ferromagnetic moment of the material. For a stoichiometrically perfect B-site ordered trivalent rare earth based system, the B/B site occupants should be in either 3+/3+ states or 4+/2+ states (or vice versa) In such a scenario, the magnetic contribution from the rare earth along with Co3+ Jahn Teller mion can lead to many exotic. The primary results from the dc magnetization measurements are discussed
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