Magnetic properties of rare-earth manganese compounds of the RMn6Ge6 type

Magnetism and transport properties of HfFe6Ge6-type Er1−x Gd x Mn6Ge6 (x=0.2−0.9) compounds

“…The quantity (g-1) J is the largest for R＝Gd and falls off rapidly towards both ends of the lanthanide series [8] . The R-and Mn-sublattice coupling is therefore stronger with increasing substitution of Gd for Er atom.…”

“…In the region immediately below T C , the compound is ferrimagnetically ordered with a basically ferromagnetic Mn-sublattice magnetization coupled antiparallel to a basically ferromagnetically aligned Gd-sublattice magnetization. The low temperature regime is characterized by an essentially antiferromagnetically ordered Mn-sublattice magnetization and an antiferromagnetically ordered Gd-sublattice magnetization [8] . In order to better understand these magnetic behaviors, the effects of Gd substitution for Er on the magnetic properties and transport properties of Er 1-x Gd x Mn 6 Ge 6 (x＝0.2-0.9) were investigated.…”

A neutron diffraction study of the magnetic ordering of HoMn6Ge6

“…[1], is complex and comprises commensurate and incommensurate structures and phase transitions related to spin reorientation phenomena. For all the presently known RMn6Ge 6 compounds studied by us (R = Dy, Ho, Er [5,13] and [14]) the incommensurate wave vectors are pointing along the hexagonal axis and their length decreases with decreasing temperature.…”

“…In a previous investigation [2] it was shown that HoMn6Ge 6 orders antiferromagnetically below T N = 466 K and shows non-Curie-Weiss behaviour above T N. Similarly to DyMn6Ge6, a second transition was observed below TN (at T t = 200 K in HoMn6Ge 6) [1].…”

“…The magnetic properties of several heavy rare earth (R) compounds of the type RMn6Ge 6 were determined recently [1,2]. These compounds have the hexagonal HfFe6Ge6-type of structure, P6/mmm space group a = 0.52 nm, c = 0.81 nm, Z = 1 [3,4].…”