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Title: Left-handed properties of manganite-perovskites La{sub 1-x}Sr{sub x}MnO{sub 3} at various dopant concentrations

The experimental study of Double Negative (DNG) state of electromagnetic wave propagating in lanthanum manganite-perovskites doped with strontium La{sub 1-x}Sr{sub x}MnO{sub 3} is provided firstly below individual Curie temperatures (in ferromagnetic metal state (FM) for La{sub 1-x}Sr{sub x}MnO{sub 3}). Various dopant concentrations are considered for ceramic specimens: x = 0.15;  0.225;  0.3;  0.45;  0.6. It is shown that dependence of the DNG-peak intensity on dopant concentration is sharply non-monotone with maximum at the dopant concentrations x = 0.225 – 0.3. This behaviour follows the change of Curie temperature with increase of dopant concentration in such substances. The obtained dependence of DNG peak intensity supports the opinion concerning the role of disorder in highly doped manganite-perovskite magnetic ceramics under study.
Authors:
 [1] ; ;  [2] ; ;  [3] ; ;  [4]
  1. Institute for Theoretical Physics NSC “Kharkov Institute of Physics and Technology” NAS of Ukraine, 1 Akademicheskaja St., Kharkov, 61108 (Ukraine)
  2. Institute of Radiophysics and Electronics NAS of Ukraine, 12 Proskura St., Kharkov, 61085 (Ukraine)
  3. Institute of Magnetism, 36-b Vernadsky Blvd., Kyiv 03142 (Ukraine)
  4. Institute of General and Inorganic Chemistry, 32/34 Palladina Blvd., Kyiv 03142 (Ukraine)
Publication Date:
OSTI Identifier:
22250797
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 3; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; CURIE POINT; DOPED MATERIALS; ELECTROMAGNETIC RADIATION; LANTHANUM; PEROVSKITE; STRONTIUM