DOI:10.5488/CMP.23.43708 arXiv:2006.12553
Title:
Insights into nature of a magnetization plateau of 3d-4f coordination polymer [Dy2Cu2]n
from a spin-1/2 Ising-Heisenberg orthogonal-dimer chain
Author(s):
J. Strečka
(Department of Theoretical Physics and Astrophysics, Faculty of Science, P.J. Šafárik University,
Park Angelinum 9, 040 01 Košice, Slovakia),
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L. Gálisová
(Institute of Manufacturing Management, Faculty of Manufacturing Technologies with the seat in Prešov, Technical University of
Košice, Bayerova 1, 080 01 Prešov, Slovakia),
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T. Verkholyak
(Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii St., 79011 Lviv, Ukraine)
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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 factors of the Ising and Heisenberg spins are investigated in detail. It is shown that the investigated quantum spin chain exhibits up to seven possible ground states depending on a mutual interplay of the magnetic field, intra- and inter-dimer coupling constants. More specifically, the frustrated and modulated quantum antiferromagnetic phases are responsible in zero-temperature magnetization curves for a zero magnetization plateau. The intermediate 1/11- and 5/11-plateaus emerge due to the frustrated and modulated quantum ferrimagnetic phases, while the intermediate 9/11- and 10/11-plateaus can be attributed to the quantum and classical ferrimagnetic phases. It is conjectured that the magnetization plateau experimentally observed in a high-field magnetization curve of 3d-4f heterobimetallic coordination polymer [{Dy(hfac)2(CH3OH)}2{Cu(dmg)(Hdmg)}2]n (H2dmg = dimethylglyoxime; Hhfac = 1,1,1,5,5,5-hexafluoropentane-2,4-dione) could be attributed to the classical and quantum ferrimagnetic phases.
Key words: Ising-Heisenberg orthogonal-dimer chain, magnetization plateau, 3d-4f coordination polymer
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