Ferromagnetism strengthening in the Lu2Fe17−xMnx system

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

“…Within the temperature range 8 − 308 K the distances between other possible pairs of Fe(Mn) atoms are always greater or less than the critical value. The obtained values of T cr increase monotonously with the Mn concentration and are in satisfactory agreement with the temperatures of "ferromagnetic-antiferromagnetic" transition Θ T (Fig.4) including the x = 0.7 sample for which the temperatures of "ferromagnetic-antiferromagnetic" and "antiferromagneticparamagnetic" transitions match and Curie temperature T C appears [4]. In the Th 2 Ni 17 -type crystal structure of Lu 2 Fe 17−x Mn x the 12j position is analogous to 18f position in the Th 2 Zn 17 -type structure of Ce 2 Fe 17−x Mn x .…”

“…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 .…”

“…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]. However, upon Mn-doping the temperature of "ferromagnetic-antiferromagnetic" transition Θ T in Lu 2 Fe 17−x Mn x increases up to Néel temperature and, finally, the compounds in the range x = 0.7 − 2 exhibit only ferromagnetic ordering with a near constant T C (x) value [4].…”

“…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]. However, upon Mn-doping the temperature of "ferromagnetic-antiferromagnetic" transition Θ T in Lu 2 Fe 17−x Mn x increases up to Néel temperature and, finally, the compounds in the range x = 0.7 − 2 exhibit only ferromagnetic ordering with a near constant T C (x) value [4].…”

Experimental and theoretical study of magnetic ordering and local atomic polarization in Ru-substitutedLu2Fe17

“…Exposure of Lu 2 Fe 17 to chemical pressure (expansion or contraction of the lattice) caused by inserting suitable interstitial and substituting atoms was investigated in Refs. [19][20][21][22][23][24]. Minor expansion of the unit cell (ß0.4%) by absorbing light interstitial elements, such as hydrogen, was shown to fully reinforce the ferromagnetic state in Lu 2 Fe 17 H [20].…”