1999/06/05 by H. Nojiri, Hiroyuki Nojiri, K. Kaneko +6 · 75 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Computer science #Magnetic and transport properties of perovskites and related materials #Physics #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.60.4142
published in Physical review. B, Condensed matter 60(6), 4142-4148 (American Physical Society) · 6 pages, 7figures to be appear in PRB
arxiv created 1999/06/05 · openalex publication_date 1999/08/01 · openalex created_date 2016/06/24 · arxiv updated 2016/08/31 · openalex updated_date 2026/08/05
It was discovered in La_1\ensuremath-xSrxMnO3 (x\ensuremath∼1/8) that a field-induced phase transition occurs from a ferromagnetic metal (FM) phase to a ferromagnetic insulator (FI) phase. The magnetization shows a sharp jump at the transition field accompanied by a remarkable increase of magnetoresistance. Striction measurements clarified that this transition is associated with the structural change from a Jahn-Teller (JT) distorted orthorhombic phase to a pseudocubic phase. These results evidently show that the FI phase with a pseudocubic symmetry is more stable in high fields than the FM phase due to the double-exchange interaction. The driving force of this transition is explained by the enhancement of the ferromagnetic superexchange interaction induced by an antiferromagnetic-type orbital ordering in the pseudocubic phase, which was recently found in the anomalous x-ray scattering experiments.