First-order phase transition to a reentrant state in a dilute anisotropic ferrimagnet

Low-temperature specific heat of frustrated ferrimagnets BaFe12−xInxO19 with x=3.0 and x=3.6

“…21 There is a simultaneous increase by almost an order of magnitude in the temperature of the phase transition to the state of the FSG type, and for TϭT f (0) the hallmarks of a first-order phase transition appear. 21,22 It cannot be ruled out that in Li-Ga spinels doped with Co 2ϩ ions a state similar to the low-temperature state in BaFe 9 In 3 O 19 is formed, since, according to Dzyaloshinskii, 23 long-period magnetic structures can form in the presence of anisotropic exchange ͑the Co 2ϩ ions͒.…”