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Title: Structural and magnetic properties of Y-doped La{sub 0.5}Sr{sub 0.5}MnO{sub 3} manganite system: Evidence of step-like magnetization

The magnetic and transport properties of bulk doped manganite, La{sub 0.5−y}Y{sub y}Sr{sub 0.5}MnO{sub 3} have been studied as a function of yttrium doping, y, for 0 ≤ y ≤ 0.25. In the absence of the yttrium this is a well studied half-doped manganite which is a metallic ferromagnet. The end members of this system (with y = 0 and 0.25) are found to be structurally different (rhombohedral and orthorhombic, respectively) due to the large distortions caused by the yttrium. These distortions make this series of compounds particularly interesting. The magnetization obtained in zero field cooled (ZFC) and field cooled (FC) studies show dramatic changes as the value of y is raised above 0.05. The magnetic behavior is further investigated by a study of the hysteresis loops, frequency dependent susceptibility and studies of the magnetic relaxation. The results are understood in terms of the average size of the cation on the A site, , and the variance, σ{sup 2} (= ∑y{sub i}{sup 2}r{sub i}{sup 2} - {sup 2}). The value of the variance, σ{sup 2}, increases rapidly with doping, y, induces melting of the long range ferromagnetic ordering, exhibiting a stepwise variation of magnetization (metamagnetic like). Based on the present resultsmore » a magnetic phase diagram has been drawn demonstrating different magnetic phase sequences with the variation of σ{sup 2}.« less
Authors:
 [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Physics, Kalyani Mahavidyalaya, Kalyani, Nadia, West Bengal-741235 (India)
  2. Department of Physics, Center for Nanoscience and Nanotechnology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan (China)
  3. Department of CMP and MS, Tata Institute of Fundamental Research, Colaba, Mumbai 400005 (India)
  4. Solid State Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032 (India)
  5. Applied Physics Department, Indian Institute of Technology (Banaras Hindu University), Varanasi-221 005 (India)
Publication Date:
OSTI Identifier:
22490180
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CATIONS; CONCENTRATION RATIO; DOPED MATERIALS; FERROMAGNETIC MATERIALS; FREQUENCY DEPENDENCE; HYSTERESIS; LANTHANUM COMPOUNDS; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MANGANATES; MELTING; ORTHORHOMBIC LATTICES; PHASE DIAGRAMS; RELAXATION; STRONTIUM COMPLEXES; TRIGONAL LATTICES; YTTRIUM; YTTRIUM COMPOUNDS