2008/05/26 by H. Sakai, Hideaki Sakai, K. Ito +11
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.77.124712
7 pages, 6 figures
arxiv created 2008/05/26 · openalex publication_date 2008/12/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Versatile features of impurity doping effects on perovskite manganites, R0.6Sr0.4MnO3, have been investigated with varying the doing species as well as the R-dependent one-electron bandwidth. In ferromagnetic-metallic manganites (R=La, Nd, and Sm), a few percent of Fe substitution dramatically decreases the ferromagnetic transition temperature, leading to a spin glass insulating state with short-range charge-orbital correlation. For each R species, the phase diagram as a function of Fe concentration is closely similar to that for R0.6Sr0.4MnO3 obtained by decreasing the ionic radius of R site, indicating that Fe doping in the phase-competing region weakens the ferromagnetic double-exchange interaction, relatively to the charge-orbital ordering instability. We have also found a contrastive impact of Cr (or Ru) doping on a spin-glass insulating manganite (R=Gd). There, the impurity-induced ferromagnetic magnetization is observed at low temperatures as a consequence of the collapse of the inherent short-range charge-orbital ordering, while Fe doping plays only a minor role. The observed opposite nature of impurity doping may be attributed to the difference in magnitude of the antiferromagnetic interaction between the doped ions.