Cation disorder and size effects in magnetoresistive manganese oxide perovskites

1996/12/01 by Lide M. Rodrı́guez-Martı́nez, J. Paul Attfield · 8 citations
Materials Science · Physics and Astronomy · Chemistry · #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Advanced Condensed Matter Physics #Magnetoresistance #Physics #Condensed matter physics #Ferromagnetism #Manganese #Energy (signal processing) #Crystallography #Atomic radius #Materials science #Magnetic field #Chemistry #Quantum mechanics

paper · doi:10.1103/physrevb.54.r15622

openalex publication_date 1996/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

Large disorder effects due to size differences between A-site R³⁺ (R=La,\phantom\rule0ex0exPr,\phantom\rule0ex0exNd,\phantom\rule0ex0exSm) and M²⁺ (M=Ca,\phantom\rule0ex0exSr,\phantom\rule0ex0exBa) cations have been found in magnetoresistive (R_0.7M_0.3)MnO₃ perovskites. The ferromagnetic-metal-paramagnetic-insulator transition temperature T_m varies as T_m=T_m(0)\ensuremath-pQ² due to strain fields resulting from ordered or disordered oxygen displacements Q that are parametrized by the statistical mean and variance of the A cation radius, respectively. The value of p is related to the Mn-O force constant showing that Mn³⁺ Jahn-Teller distortions assist electron localization at T_m. The maximum possible T_m is estimated to be \ensuremath∼530 K although experimentally observable values are \ensuremath≤360 K. A large suppression of magnetoresistance due to cation disorder is also evidenced.

Citations

• A profile refinement method for nuclear and magnetic structures
• Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides

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