Superparamagnetism and magnetic defects in Fe2VAl and Fe2VGa

Chin-Shan Lue, Joseph H. Ross, K. D.D. Rathnayaka, D. G. Naugle, S. Y. Wu, W. H. Li

研究成果: Article同行評審

50 引文 斯高帕斯(Scopus)

摘要

We have investigated the magnetic properties of Heusler-type Fe2VAl and Fe2VGa by means of susceptibility, magnetization, and nuclear magnetic resonance (NMR) measurements. As evidenced by the static and dynamic magnetic susceptibilities, both compounds exhibit the characteristic features of a superparamagnetic glass. The freezing temperatures of our samples are 23 K for Fe2VAl and 9 K for Fe2VGa. A detailed analysis indicates the coexistence of individual magnetic defects with large-moment superparamagnetic clusters. The temperature-dependent magnetization and NMR linewidth are dominated by isolated magnetic defects, identified as Fe antisite defects. The concentration of these defects, determined from NMR linewidths, is 4.5 × 10-3 in Fe2VAl, in good agreement with the value deduced from previous field-dependent specific heat measurements.

原文English
頁(從 - 到)1585-1593
頁數9
期刊Journal of Physics Condensed Matter
13
發行號7
DOIs
出版狀態Published - 2001 二月 19

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 凝聚態物理學

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