The synthesis, crystal structure, magnetization, and resistivity of Gd-doped Eu14MnSb11, Eu13.97Gd0.03MnSb11, are reported and compared to Eu14MnSb11 and Eu14MnBi11. All three compounds are isostructural with the Zintl compound Ca14AlSb11. The Gd-doped Eu transition metal Zintl compound crystallizes in the tetragonal space group I41/acd with a=17.338(3) Å and c=22.691(5) Å, where Gd partially replaces Eu in the structure. The compound displays three magnetic phase transitions: a ferromagnetic transition near 80 K, an apparent antiferromagnetic transition at a field-dependent TN (TN=30 K in zero field), and a spin-reorientation transition with a transition temperature that is near 15 K in zero field but is also field dependent. Measurements of both zero-field resistivity for 5≤T≤300 K and the magnetoresistance in fields up to 5 T for the same temperatures are presented. Negative magnetoresistance is observed over a wide range of temperatures below 200 K.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2000|
ASJC Scopus subject areas
- Condensed Matter Physics