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The ground state and magnetization process of an exactly solved spin-$1/2$Ising-Heisenberg orthogonal-dimer chain with two different gyromagnetic factorsof the Ising and Heisenberg spins are investigated in detail. It is shown thatthe investigated quantum spin chain exhibits up to seven possible ground statesdepending on a mutual interplay of the magnetic field, intra- and inter-dimercoupling constants. More specifically, the frustrated and modulated quantumantiferromagnetic phases are responsible in zero-temperature magnetizationcurves for a zero magnetization plateau. The intermediate 1/11- and5/11-plateaus emerge due to the frustrated and modulated quantum ferrimagneticphases, while the intermediate 9/11- and 10/11-plateaus can be attributed tothe quantum and classical ferrimagnetic phases. It is conjectured that themagnetization plateau experimentally observed in a high-field magnetizationcurve of 3$d$-4$f$ heterobimetallic coordination polymer[\{Dy(hfac)$_2$(CH$_3$OH)\}$_2$\{Cu(dmg)(Hdmg)\}$_2$]$_n$ (H$_2$dmg $=$dimethylglyoxime; Hhfac $=$ 1,1,1,5,5,5-hexafluoropentane-2,4-dione) could beattributed to the classical and quantum ferrimagnetic phases.

condensed matter physics

Insights into nature of a magnetization plateau of 3$d$-4$f$  coordination polymer [Dy$_2$Cu$_2$]$_n$ from a spin-1/2 Ising-Heisenberg  orthogonal-dimer chain