ABSTRACT
The magnetic structure is, broadly speaking, determined by the
following four factors, that is, the type of interaction, the di-
mensionality, the spin quantum number, and the coordination
number or the crystal structure. Being different from simple
ferromagnetism, antiferromagnetism, and ferrimagnetism, several
magnetic interactions sometimes coexist in materials, resulting
in a complex magnetic structure. In this chapter, we discuss the
partially disordered antiferromagnetic (PDA) transition realized via
the novel ordering process for Ca3Co2O6, research on which has
been superficial and reported for limited one-dimensional (1D)
materials such as CsCoCl3.
