Cation size-temperature phase diagram of the manganites Ln0.5Sr0.5MnO3

• DOI: 10.1063/1.363873
• Publication Date: 2002-07-26T12:43:06Z
• Authors: F. Damay; A. Maignan; C. Martin; B. Raveau
• Keywords: Manganite; Colossal Magnetoresistance

We have studied the variation of paramagnetic to ferromagnetic transition temperature TC and antiferromagnetic TN as a function average size A site cations (Ln, Sr) in manganite perovskites Ln0.5Sr0.5MnO3 (Ln=Gd, Sm, Y, Pr, La). For our investigation we used dc resistivity, magnetization, susceptibility magnetoresistance measurements. Results show that Curie increases from 85 310 K when 〈rA〉 varies 1.221 1.263 Å, whereas remains stable around 150 K. magnetic phase diagram temperature-〈rA〉 has been established, allowing five regions with different behaviours be evidenced: insulating, metallic, canted weak insulating. The extension these is determined by value applied field.