Suppression of the magnetic phase transition in manganites close to the metal-insulator crossover

2003/11/20 by F. Rivadulla, J. Rivas, John B. Goodenough +1 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.70.172410

9 pages, 3 figures

arxiv created 2003/11/20 · openalex publication_date 2004/11/18 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report the suppression of the ferromagnetic phase transition in La_1\ensuremath-xCa_xMnO₃ close to the localized-to-itinerant electronic transition, i.e., at x\ensuremath≈0.2 and x\ensuremath≈0.5. A new crossover temperature T_f can be defined for these compositions instead of T_C. Unlike in common continuous magnetic phase transition the susceptibility does not diverge at T_f and a spontaneous magnetization cannot be defined below it. We propose that the proximity to the doping-induced metal-insulator transition breaks up the electronic/magnetic homogeneity of the system and explains these effects.

Citations

• Lectures on Phase Transitions and the Renormalization Group
• On a generalised approach to first and second order magnetic transitions
• The pseudogap in high-temperature superconductors: an experimental survey

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