Open AccessAnisotropic microcrystalline powder alignment of the weak-ferromagnetic superconductor system RuSr2RCu2O8(R = Pr, Nd, Sm, Eu, Gd, Gd0.5Dy0.5)
Author(s) -
B. C. Chang,
Chao-Hsing Hsu,
M. F. Tai,
Y. Y. Hsu,
H.C. Ku
Publication year - 2009
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/150/5/052033
Subject(s) - anisotropy , tetragonal crystal system , materials science , paramagnetism , microcrystalline , ferromagnetism , condensed matter physics , rotation (mathematics) , magnetic anisotropy , superconductivity , magnetic field , crystallography , crystal structure , magnetization , optics , physics , chemistry , geometry , mathematics , quantum mechanics
[[abstract]]The powder alignment method is used to investigate the anisotropic physical properties of the weak-ferromagnetic superconductor system RuSr2RCu2O8 (R = Pr, Nd, Sm, Eu, Gd, Gd0.5Dy0.5). 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.[[fileno]]2010102010228[[department]]物理