Structural, electrical and magnetic properties of two-dimensional La 1.2 (Sr 1.8-x Ca x )Mn 2 O 7 manganites

C. H. Shen, R. S. Liu, Shu-Fen Hu, J. G. Lin, C. Y. Huang, H. S. Sheu

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Abstract

The effects of structural, electrical and magnetic properties with the isovalent chemical substitution of Ca 2+ into the Sr 2+ sites in La 1.2 (Sr 1.8-x Ca x )Mn 2 O 7 (x = 0-0.8) are investigated. The highest magnetoresistance ratio [ρ(0)/ρ(H)] of 208% (H = 1.5 T) at a temperature of 102 K was observed for the x = 0.4 sample. The Curie temperatures decreased from 135 to 102 K for x = 0-0.4, respectively. Moreover, the Weiss constants θ were varied from the positive to negative value with increasing Ca concentration. The antiferromagnetic behavior with Néel temperature around 30 K was found in the x = 0.8 sample. The magnetization measurements show that the hysteresis phenomenon appeared at the temperatures below the Curie or Néel temperatures.

Original languageEnglish
Pages (from-to)2178-2184
Number of pages7
JournalJournal of Applied Physics
Volume86
Issue number4
DOIs
Publication statusPublished - 1999 Aug 15

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electrical properties
magnetic properties
Curie temperature
temperature
hysteresis
substitutes
magnetization

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Structural, electrical and magnetic properties of two-dimensional La 1.2 (Sr 1.8-x Ca x )Mn 2 O 7 manganites . / Shen, C. H.; Liu, R. S.; Hu, Shu-Fen; Lin, J. G.; Huang, C. Y.; Sheu, H. S.

In: Journal of Applied Physics, Vol. 86, No. 4, 15.08.1999, p. 2178-2184.

Research output: Contribution to journalArticle

Shen, C. H. ; Liu, R. S. ; Hu, Shu-Fen ; Lin, J. G. ; Huang, C. Y. ; Sheu, H. S. / Structural, electrical and magnetic properties of two-dimensional La 1.2 (Sr 1.8-x Ca x )Mn 2 O 7 manganites In: Journal of Applied Physics. 1999 ; Vol. 86, No. 4. pp. 2178-2184.
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