substitution series*

As part of an extensive study of the RFe₂Ge₂ series [1] a SDW-like transition was discovered in LuFe₂Ge₂ near 9 K. Given that LuFe₂Ge₂ has the same structure as the AFe₂As₂ (A =Alkali and Alkali-Earth) Fe-based superconductors, the possibility of LuFe₂Ge₂ manifesting fragile magentism [2], and even exotic, emergent states that could be revealed as T-SDW is suppressed toward zero, was enticing. To address this, a study of Y, Sc, Co and Ru substitutions into LuFe₂Ge₂ was made [3]. Although phase diagrams constructed down to 2-3 K failed to reveal emergent effects [3], in this talk we will present magnetization and specific heat data down to 400 mK and 100 mK respectively. Updated phase diagrams will be presented and discussed.

[1] M.A. Avila et al., JMMM 270 (2004) 51.
[2] P.C. Canfield and S.L. Bud'ko, Annual Rev. of CMP 1 (2010) 27.
[3] S. Ran et al., Phil. Mag. 91 (2011) 4388.