Anisotropic microcrystalline powder alignment of the weak-ferromagnetic superconductor system RuSr2RCu2O8 (R Pr, Nd, Sm, Eu, Gd, Gd0.5Dy0.5)

B. C. Chang, C. H. Hsu, M. F. Tai, Y. Y. Hsu, H. C. Ku

Research output: Contribution to journalArticle

Abstract

The powder alignment method is used to investigate the anisotropic physical properties of the weak-ferromagnetic superconductor system RuSr 2RCu2O8 (R Pr, Nd, Sm, Eu, Gd, Gd 0.5Dy0.5). Due to weak magnetic anisotropy of this tetragonal system, partially c-axis aligned microcrystalline powder (diameter ∼ 1-10 μm) in epoxy can be obtained only for R Eu and Gd through the field-rotation powder alignment method where c-axis is perpendicular to the aligned magnetic field Ba 0.9 T and parallel to the rotation axis. For smaller rare earth compound R Gd0.5Dy0.5, powder alignment can be achieved using the simple field powder alignment method where c-axis is partially aligned along the aligned magnetic field. No powder alignment can be achieved for larger rare earths R Pr, Nd or Sm due to the lack of magnetic anisotropy in these compounds. The mechanism of powder alignment at room temperature using the spin-orbital-related anisotropic paramagnetic susceptibility and the low temperature anisotropic physical properties of RuSr2EuCu2O8 is discussed.

Original languageEnglish
Article number052033
JournalJournal of Physics: Conference Series
Volume150
Issue number5
DOIs
Publication statusPublished - 2009

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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