Effect of concentration deviation from stoichiometry on the magnetism of Mn1+δAs0.75Sb0.25

T. Morikawa, Hirofumi Wada, R. Kogure, S. Hirosawa

Research output: Contribution to journalArticle

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Abstract

Mn1+δAs0.75Sb0.25 samples with excess Mn content of 0.00≤δ≤0.11 were synthesized and subjected to the identification of the phases and the magnetic measurements. The stoichiometric Mn1.00As0.75Sb0.25 alloy consisted of two phases with mainly the NiAs-type structure leaving a small amount of Sb as a secondary phase. The samples with δ ≥ 0.05 formed a single phase with the NiAs-type structure. These results suggest that some Mn atoms occupy the interstitial site of the NiAs-type structure, as observed in the case of Mn1 + δSb. The Curie temperature and the magnetic moment were decreased with the increase of the excess Mn content and the transition from a ferromagnetic to paramagnetic state turned much broader. The magnetic entropy change, which is estimated from the magnetization vs. temperature curve, was reduced drastically when δ ≥ 0.08. No field-induced magnetic transition was observed for δ ≥ 0.08 in the magnetization curve up to 5T, though the compounds with 0.00 ≤ δ ≤ 0.05 exhibited such a transition from a paramagnetic to ferromagnetic state just above TC. These results indicate that interstitial Mn atoms have a significant effect on the magnetism of Mn1+δAs 0.75Sb0.25.

Original languageEnglish
Pages (from-to)322-328
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume283
Issue number2-3
DOIs
Publication statusPublished - Dec 1 2004
Externally publishedYes

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Magnetism
Stoichiometry
stoichiometry
Magnetization
deviation
Atoms
Magnetic variables measurement
interstitials
Curie temperature
Magnetic moments
magnetization
Entropy
curves
magnetic measurement
atoms
magnetic moments
entropy
Temperature
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Effect of concentration deviation from stoichiometry on the magnetism of Mn1+δAs0.75Sb0.25. / Morikawa, T.; Wada, Hirofumi; Kogure, R.; Hirosawa, S.

In: Journal of Magnetism and Magnetic Materials, Vol. 283, No. 2-3, 01.12.2004, p. 322-328.

Research output: Contribution to journalArticle

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AU - Hirosawa, S.

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AB - Mn1+δAs0.75Sb0.25 samples with excess Mn content of 0.00≤δ≤0.11 were synthesized and subjected to the identification of the phases and the magnetic measurements. The stoichiometric Mn1.00As0.75Sb0.25 alloy consisted of two phases with mainly the NiAs-type structure leaving a small amount of Sb as a secondary phase. The samples with δ ≥ 0.05 formed a single phase with the NiAs-type structure. These results suggest that some Mn atoms occupy the interstitial site of the NiAs-type structure, as observed in the case of Mn1 + δSb. The Curie temperature and the magnetic moment were decreased with the increase of the excess Mn content and the transition from a ferromagnetic to paramagnetic state turned much broader. The magnetic entropy change, which is estimated from the magnetization vs. temperature curve, was reduced drastically when δ ≥ 0.08. No field-induced magnetic transition was observed for δ ≥ 0.08 in the magnetization curve up to 5T, though the compounds with 0.00 ≤ δ ≤ 0.05 exhibited such a transition from a paramagnetic to ferromagnetic state just above TC. These results indicate that interstitial Mn atoms have a significant effect on the magnetism of Mn1+δAs 0.75Sb0.25.

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