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Title: A comparative study of the magnetic properties and phase separation behavior of the rare earth cobaltates, Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} (Ln=rare earth)

Abstract

A comparative study of the magnetic properties of a few members of the Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} family with different radii of the A-site cations, <r{sub A} >, in the range 1.19-1.40 A has been carried out. The apparent T {sub c} (where the magnetization undergoes an abrupt increase) decreases markedly with <r{sub A} > as well as the size-disorder arising from the mismatch in the size of the A-site cations. The value of the magnetization at low temperatures decreases markedly with decrease in <r{sub A} > or increase in size-disorder, suggesting that the relative proportion of the ferromagnetic (FM) species decreases relative to that of the paramagnetic (PM) species. Such a variation of the FM/PM ratio with composition and temperature is evidenced from the Moessbauer spectra of La{sub 0.5}Sr{sub 0.5}CoO{sub 3} as well. The variation of the FM/PM ratio with <r{sub A} > and size-disorder, as well as a local-probe study using {sup 59}Co Nuclear magnetic resonance spectroscopy suggest that electronic phase separation is an inherent feature of the Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} type cobaltates, with the nature of the different magnetic species in the phase-separated system varying with <r{sub A} > and size disorder. - Graphicalmore » abstract: Variation of (a) T {sub c} and (b) FC magnetization at 1000 Oe with <r{sub A} > at 120 K in Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} and Dy{sub 0.34}Nd{sub 0.16}Sr{sub 0.40}Ca{sub 0.10}CoO{sub 3}.« less

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064 (India)
  2. Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064 (India)
  3. Chemistry and Physics of Materials Unit and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064 (India), E-mail: cnrrao@jncasr.ac.in
Publication Date:
OSTI Identifier:
21015779
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 180; Journal Issue: 4; Other Information: DOI: 10.1016/j.jssc.2007.02.003; PII: S0022-4596(07)00076-X; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COBALT COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; MOESSBAUER EFFECT; NUCLEAR MAGNETIC RESONANCE; OXIDES; PARAMAGNETISM; RARE EARTH COMPOUNDS; SPECTROSCOPY; STRONTIUM COMPOUNDS; TEMPERATURE RANGE 0065-0273 K

Citation Formats

Kundu, Asish, Sarkar, R., Pahari, B., Ghoshray, A., and Rao, C.N.R. A comparative study of the magnetic properties and phase separation behavior of the rare earth cobaltates, Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} (Ln=rare earth). United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.02.003.
Kundu, Asish, Sarkar, R., Pahari, B., Ghoshray, A., & Rao, C.N.R. A comparative study of the magnetic properties and phase separation behavior of the rare earth cobaltates, Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} (Ln=rare earth). United States. doi:10.1016/j.jssc.2007.02.003.
Kundu, Asish, Sarkar, R., Pahari, B., Ghoshray, A., and Rao, C.N.R. Sun . "A comparative study of the magnetic properties and phase separation behavior of the rare earth cobaltates, Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} (Ln=rare earth)". United States. doi:10.1016/j.jssc.2007.02.003.
@article{osti_21015779,
title = {A comparative study of the magnetic properties and phase separation behavior of the rare earth cobaltates, Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} (Ln=rare earth)},
author = {Kundu, Asish and Sarkar, R. and Pahari, B. and Ghoshray, A. and Rao, C.N.R.},
abstractNote = {A comparative study of the magnetic properties of a few members of the Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} family with different radii of the A-site cations, <r{sub A} >, in the range 1.19-1.40 A has been carried out. The apparent T {sub c} (where the magnetization undergoes an abrupt increase) decreases markedly with <r{sub A} > as well as the size-disorder arising from the mismatch in the size of the A-site cations. The value of the magnetization at low temperatures decreases markedly with decrease in <r{sub A} > or increase in size-disorder, suggesting that the relative proportion of the ferromagnetic (FM) species decreases relative to that of the paramagnetic (PM) species. Such a variation of the FM/PM ratio with composition and temperature is evidenced from the Moessbauer spectra of La{sub 0.5}Sr{sub 0.5}CoO{sub 3} as well. The variation of the FM/PM ratio with <r{sub A} > and size-disorder, as well as a local-probe study using {sup 59}Co Nuclear magnetic resonance spectroscopy suggest that electronic phase separation is an inherent feature of the Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} type cobaltates, with the nature of the different magnetic species in the phase-separated system varying with <r{sub A} > and size disorder. - Graphical abstract: Variation of (a) T {sub c} and (b) FC magnetization at 1000 Oe with <r{sub A} > at 120 K in Ln {sub 0.5}Sr{sub 0.5}CoO{sub 3} and Dy{sub 0.34}Nd{sub 0.16}Sr{sub 0.40}Ca{sub 0.10}CoO{sub 3}.},
doi = {10.1016/j.jssc.2007.02.003},
journal = {Journal of Solid State Chemistry},
number = 4,
volume = 180,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}