Magnetic and structural properties of Ce2Fe17−xMnx compounds

Ce valence in intermetallic compounds by means of XANES spectroscopy

“…Concerning another type of systems, in which a cooperation between the rare-earth ions with intermediate valence state and the 3d elements takes place like in our Ce 2 Fe 17 compound, it is assumed that the type of magnetic state and Curie temperature result from the competition of positive and negative exchange interactions between the 3d metal atoms [8]. The phase diagram of Ce 2 Fe 17Àx Mn x is rather complicated: the basic magnetic state is ferromagnetic, but in the Mn concentration range x ¼ 0:5 À 1 it is helical antiferromagnetic [9]. One reason for the non-monotonous dependence of the magnetic parameters can be an instability of the Ce atom valence state: the Ce 4f electronic state throughout its hybridization with 3d-electrons of Fe and Mn can influence the magnetic state of the whole compound.…”

Influence of lattice volume on magnetic states of Ce2Fe16MnDy compounds (y=,1,2.3)

“…Over the whole Mn-concentration range the magnetization decreases with increasing Mn content. 12 The disappearance of the ferromagnetism in AFM Ce 2 Fe 17−x Mn x compounds ͑0.5ഛ x Ͻ 1.3͒ cannot be entirely explained in the way it has been done for the binary compound. According to Ref.…”

“…Mn occupies mainly dumbbell 6c site and avoids 9d site whereas 18f and 18h sites are occupied almost equally. 12 The effect of the substitution on the magnetic properties can be divided in two parts. For small Mn contents, the temperature stability range of the FM ground state gets narrowed and suppressed completely when x = 0.5.…”

XAFS and XRD studies of local structure peculiarities in magnetic R2Fe17−xMnx(R = Ce, Lu) intermetallics

“…The preparation and temperatures of magnetic transitions in Ce 2 Fe 17−x Mn x (x = 0; 1; 2) and Lu 2 Fe 17−x Mn x (x = 0; 0.2; 0.5; 0.7; 2) samples are reported in [3,4,6]. The X-ray absorption spectra were collected at C beamline of DORIS III storage ring (DESY, Hamburg, Germany) above K-Ce (40443 eV) and L 3 -Ce (5723 eV) absorption edges on Ce 2 Fe 17−x Mn x and above L 3 -Lu (9244 eV) absorption edge on Lu 2 Fe 17−x Mn x .…”

“…Introduction R 2 Fe 17 (R -rare-earth element) intermetallic compounds are extensively studied due to large magnetic moments and multiple magnetic transitions [1,2]. In compound Ce 2 Fe 17 with the Th 2 Zn 17 -type crystal structure the partial substitution of Mn for Fe causes the origin of unusual magnetic properties: at the low temperature the basic state is ferromagnetic, but in the Mn concentration range x = 0.5 − 1.0 it is helical antiferromagnetic [3]. The Lu 2 Fe 17 compound with related Th 2 Ni 17 -type structure exhibit the similar magnetic behavior as Ce 2 Fe 17 being ferromagnetic at low temperature and antiferromagnetic at higher temperature [4].…”