Influence of Ga doping on rare earth moment ordering and ferromagnetic transition in Nd 0.7 Sr 0.3 Co 1-x Ga x O 3

Pawan Kumar, D. V. Maheswar Repaka, M. Aparnadevi, T. S. Tripathi, R. Mahendiran*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

We report the impact of dilution of Co sublattice by non-magnetic Ga 3 ion on the magnetic, electrical, and magnetoresistive properties in Nd 0.7 Sr 0.3 Co 1-x Ga x O 3 for x 0-0.12. Field-cooled magnetization of the parent compound (x 0) shows an anomalous maximum at T 54.6 K much below the onset of ferromagnetic transition (T C 160 K) of the Co sublattice, which is attributed to the polarization of Nd-4f moments antiparallel to the Co-3d sublattice. Both T C and T shift to low temperature with increasing x and the Nd-4f spin reverses from antiparallel to parallel with increasing strength of the magnetic field. While the value of high field magnetization is not seriously affected by Ga doping, coercive field at 10 K increases dramatically with increasing x. Ga substitution transforms ferromagnetic metallic state into ferromagnetic insulating state for x 0.03 and decreases the magnitude of magnetoresistance from 6 for x 0 to 0.5 for x 0.12.

Original languageEnglish
Article numberARTN 17D702
Number of pages3
JournalJournal of Applied Physics
Volume113
Issue number17
DOIs
Publication statusPublished - 7 May 2013
MoE publication typeA1 Journal article-refereed
EventJoint MMM-Intermag Conference - Chicago, United States
Duration: 14 Jan 201318 Jan 2013
Conference number: 12

Keywords

  • MAGNETIC-PROPERTIES
  • TRANSPORT-PROPERTIES
  • LA1-XSRXCOO3
  • PHASES

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