  Zero temperature non-plateau magnetization is a peculiar property of a
quantum spin chain and it sometimes appears due to different gyromagnetic
factors. In this study, we illustrate a quite unusual nonplateau magnetization
property driven by XY-anisotropy in an Ising-XYZ diamond chain. Two particles
with spin-1/2 are bonded by XYZ coupling and they are responsible for the
emergence of non-plateau magnetization. These two quantum operator spins are
bonded to two nodal Ising spins and this process is repeated infinitely to
yield a diamond chain structure. Due to the non-plateau magnetization property,
we focus our discussion on the magnetocaloric effect of this model by
presenting the isentropic curves and the Gruneisen parameters, as well as
showing the regions where the model exhibits an efficient magnetocaloric
effect. Due to the existence of two phases located very close to each other,
the strong XY-anisotropy exhibits a particular behavior with a magnetocaloric
effect, with a wider interval in the magnetic field, where the magnetocaloric
effect is efficient.
