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Title: Spin-glass behavior in Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3}

Abstract

With a view to investigate the effect of small size of A-site cations on the magnetic properties of the rare earth cobaltates, Ln {sub 1-} {sub x}A{sub x} CoO{sub 3} (Ln=rare earth, A=alkaline earth), we have investigated Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} in detail. For this purpose, we have carried out low-field DC magnetization and ac susceptibility measurements including a study of magnetic relaxation and memory effects. Both Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} show frequency-dependent transitions at 70 and 55 K respectively in the ac susceptibility data, due to the onset of spin-glass like behavior. Their relaxation behavior exhibits aging effects. In addition, memory effects are found in the magnetization behavior. These characteristics establish spin-glass behavior in both these cobaltates, a behavior that is distinctly different from that of La{sub 0.7}Ca{sub 0.3}CoO{sub 3} and La{sub 0.5}Sr{sub 0.5}CoO{sub 3} which show well-defined ferromagnetic transitions, albeit without long-range ordering.

Authors:
 [1];  [2];  [3];  [4]
  1. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064 (India)
  2. (Sweden)
  3. Department of Engineering Sciences, Uppsala University, 751 21 Uppsala (Sweden)
  4. Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064 (India). E-mail: cnrrao@jncasr.ac.in
Publication Date:
OSTI Identifier:
20784938
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 179; Journal Issue: 3; Other Information: DOI: 10.1016/j.jssc.2005.12.014; PII: S0022-4596(05)00608-0; Copyright (c) 2005 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; ALKALINE EARTH METAL COMPOUNDS; CATIONS; COBALT COMPOUNDS; FREQUENCY DEPENDENCE; MAGNETIC PROPERTIES; MAGNETIZATION; RARE EARTH COMPOUNDS; RELAXATION; SPIN GLASS STATE

Citation Formats

Kundu, Asish K., Department of Engineering Sciences, Uppsala University, 751 21 Uppsala, Nordblad, P., and Rao, C.N.R. Spin-glass behavior in Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3}. United States: N. p., 2006. Web. doi:10.1016/j.jssc.2005.12.014.
Kundu, Asish K., Department of Engineering Sciences, Uppsala University, 751 21 Uppsala, Nordblad, P., & Rao, C.N.R. Spin-glass behavior in Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3}. United States. doi:10.1016/j.jssc.2005.12.014.
Kundu, Asish K., Department of Engineering Sciences, Uppsala University, 751 21 Uppsala, Nordblad, P., and Rao, C.N.R. Wed . "Spin-glass behavior in Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3}". United States. doi:10.1016/j.jssc.2005.12.014.
@article{osti_20784938,
title = {Spin-glass behavior in Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3}},
author = {Kundu, Asish K. and Department of Engineering Sciences, Uppsala University, 751 21 Uppsala and Nordblad, P. and Rao, C.N.R.},
abstractNote = {With a view to investigate the effect of small size of A-site cations on the magnetic properties of the rare earth cobaltates, Ln {sub 1-} {sub x}A{sub x} CoO{sub 3} (Ln=rare earth, A=alkaline earth), we have investigated Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} in detail. For this purpose, we have carried out low-field DC magnetization and ac susceptibility measurements including a study of magnetic relaxation and memory effects. Both Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} show frequency-dependent transitions at 70 and 55 K respectively in the ac susceptibility data, due to the onset of spin-glass like behavior. Their relaxation behavior exhibits aging effects. In addition, memory effects are found in the magnetization behavior. These characteristics establish spin-glass behavior in both these cobaltates, a behavior that is distinctly different from that of La{sub 0.7}Ca{sub 0.3}CoO{sub 3} and La{sub 0.5}Sr{sub 0.5}CoO{sub 3} which show well-defined ferromagnetic transitions, albeit without long-range ordering.},
doi = {10.1016/j.jssc.2005.12.014},
journal = {Journal of Solid State Chemistry},
number = 3,
volume = 179,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}