2008/03/13 by M. Giot, A. Pautrat, Alain Pautrat +7 · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Shape Memory Alloy Transformations #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.77.134445
accepted in Phys Rev B
arxiv created 2008/03/13 · openalex publication_date 2008/04/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report on the magnetic properties of the manganite Bi_1\ensuremath-xCaxMnO3 (x=0.33) at low temperature. The analysis of the field expansion of the ac susceptibility and the observation of aging properties make clear that a spin-glass phase appears below T=39\phantom\rule0.3em0exK in the presence of magnetic order. Neutron scattering shows both magnetic Bragg scattering and magnetic diffusion at small angles and confirms this coexistence. In contrast to Pr_1\ensuremath-xCaxMnO3 (x=0.3--0.33), which exhibits a mesoscopic phase separation responsible for a field driven percolation, the glassy and short range ferromagnetic order observed here does not cause a colossal magnetoresistance.