1.5.3.7 References for 1.5.3

Solid Solubility and Magnetism upon Mn Incorporation in the Bulk Ternary Carbides Cr2AlC and Cr2GaC

“…No other impurity phases, such as Mn 3 GaC, were detected. Figure 6 presents the temperature dependence of the specific magnetic moment determined by VSM of the HCl treated (Cr,Mn) 2 GaC sample in the 10-370 K range at a magnetic field of 0.05 T. A relatively large and abrupt change in magnetization is observed at 153 K; a smaller change is observed at 38 K. Since neither of these temperatures correspond to a magnetic transition temperature of any of known magnetic phases in the Cr-Mn-Ga-C system, such as Mn 2 Ga (690 K), [24] [25] or Mn 7 Ga 6 (480 K), [25] it is reasonable to assume that (Cr,Mn) 2 GaC is a magnetic phase. This conclusion is further supported by similar observations in the (Cr,Mn) 2 GeC system very recently reported by Tao et al, [13] where transitions in magnetization as a function of temperature were observed at ∼30 and 120-320 K, the latter as a function of Mn concentration.…”

“…The behavior has been suggested to originate from phase separation into Mn-rich and Mn-poor regions on the nanoscale, Mn-rich regions having an FM component with a Curie temperature that depends on the Mn content, and Mn-poor regions exhibiting a re-entrant cluster glass transition at low temperature. As the investigated sample contains a small fraction of Mn 2 Ga 5 (Curie temperature of 451 K), [25] the magnetic response may be affected through an increased background signal, visible in the 153-370 K range. At this time it is not clear why Lin et al [12] did not observe a comparable signal.…”