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Title: Effect of Zn substitution on para- to ferromagnetic transition temperature in La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} colossal magnetoresistance materials

Abstract

Structural, magnetic, and thermal measurements are carried out on the La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} system with x=0.0-0.50. The structural characterization of the samples is done by Rietveld analysis of their neutron diffraction patterns. Zn substitutes at Mn site isostructurally until x=0.30. Oxygen content remains nearly invariant with x. Magnetic and thermal measurements as well as the electrical resistance show a para- to-ferromagnetic transition at T{sub p}, which decreases with an increase of x. For low Zn concentration (until x=0.075) the decrease dT{sub p}/dx is smaller than for the larger concentrations of Zn. Relative decrease dT{sub p}/dx at higher concentrations (x>0.10) is similar to that observed earlier for the La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Fe{sub x}O{sub 3} system. For the transition at T{sub p}, the related change of magnetic entropy ({delta}S{sub trs}) are calculated from the heat capacity data and indicate that for x=0 the expected value {delta}S{sub trs}=12.8 J/mol K is recovered. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [2];  [2];  [2];  [3];  [3];  [4];  [5]
  1. Max-Planck-Institut fuer Festkoerperforschung Heisenbergstr-1, D-70569 Stuttgart, (Germany)
  2. National Physical Laboratory, K. S. Krishnan Marg, New Delhi 110012, (India)
  3. Instituto de Fisica, Gleb Wataghin, UNICAMP 13083-970, Campinas, SP, (Brazil)
  4. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005, (India)
  5. Research Reactor Facility, University of Missouri, Columbia, Missouri 65211 (United States)
Publication Date:
OSTI Identifier:
20216219
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; CALCIUM OXIDES; MANGANESE OXIDES; ZINC OXIDES; MAGNETORESISTANCE; STRUCTURAL CHEMICAL ANALYSIS; NEUTRON DIFFRACTION; PHASE TRANSFORMATIONS; MAGNETIC PROPERTIES; SPECIFIC HEAT; EXPERIMENTAL DATA

Citation Formats

Awana, V. P. S., Schmitt, E., Gmelin, E., Gupta, Anurag, Sedky, A., Narlikar, A. V., Lima, O. F. de, Cardoso, Claudio A., Malik, S. K., and Yelon, W. B. Effect of Zn substitution on para- to ferromagnetic transition temperature in La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} colossal magnetoresistance materials. United States: N. p., 2000. Web. doi:10.1063/1.373239.
Awana, V. P. S., Schmitt, E., Gmelin, E., Gupta, Anurag, Sedky, A., Narlikar, A. V., Lima, O. F. de, Cardoso, Claudio A., Malik, S. K., & Yelon, W. B. Effect of Zn substitution on para- to ferromagnetic transition temperature in La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} colossal magnetoresistance materials. United States. doi:10.1063/1.373239.
Awana, V. P. S., Schmitt, E., Gmelin, E., Gupta, Anurag, Sedky, A., Narlikar, A. V., Lima, O. F. de, Cardoso, Claudio A., Malik, S. K., and Yelon, W. B. Mon . "Effect of Zn substitution on para- to ferromagnetic transition temperature in La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} colossal magnetoresistance materials". United States. doi:10.1063/1.373239.
@article{osti_20216219,
title = {Effect of Zn substitution on para- to ferromagnetic transition temperature in La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} colossal magnetoresistance materials},
author = {Awana, V. P. S. and Schmitt, E. and Gmelin, E. and Gupta, Anurag and Sedky, A. and Narlikar, A. V. and Lima, O. F. de and Cardoso, Claudio A. and Malik, S. K. and Yelon, W. B.},
abstractNote = {Structural, magnetic, and thermal measurements are carried out on the La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Zn{sub x}O{sub 3} system with x=0.0-0.50. The structural characterization of the samples is done by Rietveld analysis of their neutron diffraction patterns. Zn substitutes at Mn site isostructurally until x=0.30. Oxygen content remains nearly invariant with x. Magnetic and thermal measurements as well as the electrical resistance show a para- to-ferromagnetic transition at T{sub p}, which decreases with an increase of x. For low Zn concentration (until x=0.075) the decrease dT{sub p}/dx is smaller than for the larger concentrations of Zn. Relative decrease dT{sub p}/dx at higher concentrations (x>0.10) is similar to that observed earlier for the La{sub 0.67}Ca{sub 0.33}Mn{sub 1-x}Fe{sub x}O{sub 3} system. For the transition at T{sub p}, the related change of magnetic entropy ({delta}S{sub trs}) are calculated from the heat capacity data and indicate that for x=0 the expected value {delta}S{sub trs}=12.8 J/mol K is recovered. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.373239},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}