Competing magnetic interactions in rare-earth manganese silicides and germanides

Magnetic and magnetocaloric results of magnetic field-induced transitions in La1−xCexMn2Si2 (x=0.35 and 0.45) compounds

“…The Mn sublattice in RMn 2 X 2 undergoes a variety of temperatureinduced magnetic phase transitions and orders in diverse configurations. The magnetic moment in RT 2 X 2 compounds is also largest when the 3d element is Mn [4]. Early studies on RMn 2 X 2 compounds have described a relatively simple picture for the magnetic structure.…”

“…According to these studies depending on the intralayer Mn-Mn spacing governed by the lattice parameter a, moments in adjacent Mn layers can align parallel along the c-axis at the Curie temperature T inter C when a 44.06Å, or antiparallel with a Neé l temperature T inter N when ao4.06Å. Moreover, intralayer in-plane antiferromagnetic (AF) ordering can additionally occur at T inter N lying at around 400 K, well above T inter C [4]. For these reasons, RMn 2 X 2 compounds attracted particular attention and became one of the most thoroughly studied among the ThCr 2 X 2 -structured systems.…”

Ferromagnetic feature from Mn near room temperature in the fine particles of GdMn 2 Ge 2 and TbMn 2 Ge 2

“…The magnetic behavior of Mn in this family of ternary compounds is thus shown to be to some extent dictated by the size of the particles and possibly defects introduced by milling, apart from the role of Mn-Mn separation and of the recently proposed role of the ligands [13]. Magnetization by magnetic field as a function of temperature for GdMn 2 Ge 2 measured in a field of (a) 5 kOe for zero-field-cooled condition and (b) 100 Oe for zero-field-cooled and field-cooled conditions of the bulk and fine particles.…”

La1-xCexMn2Si2 (x=0.35 ve 0.45) kritik davranışının manyetik entropi değişim bağlılığına göre araştırılması

“…RT 2 X 2 compounds form mainly in the ThCr 2 Si 2 structure (space group I4/mmm), with the layered nature of this crystal structure leading to strong dependence of the magnetic interactions on the interplanar and intraplanar interatomic distances [20][21][22][23]. RMn 2 X 2 compounds with X = Si or Ge have attracted special attention, due to the interesting interplay between the magnetism of the layers of 3d and 4f atoms, the strong dependence of the magnitude of the Mn moment and the magnetic state of the Mn sublattice on the Mn-Mn interatomic distances [21].…”

“…The magnetic structure of these compounds explained in Ref. [23,21,46]. Above the Curie temperature samples have antiferromagnetic structure called AFl (magnetic structure is characterized by antiferromagnetic (001) Mn layers).…”