Effect of uniaxial single-ion anisotropy on a stability of intermediate magnetization plateaus of a spin-1 Heisenberg diamond cluster

被引:1
作者
Karl'ova, Katarina [1 ]
Strecka, Jozef [1 ]
Hagiwara, Masayuki [2 ]
机构
[1] Safarik Univ, Fac Sci, Dept Theoret Phys & Astrophys, Pk Angelinum 9, Kosice 04001, Slovakia
[2] Osaka Univ, Ctr Adv High Magnet Field Sci, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan
关键词
Heisenberg diamon d cluster; Magnetization plateau; Exact diagonalization; Uniaxial single-ion anisotropy; FRUSTRATION; COMPLEX;
D O I
10.1016/j.jmmm.2021.168587
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ground-state phase diagrams and magnetization curves of a spin-1 Heisenberg diamond cluster with two different coupling constants and uniaxial single-ion anisotropy are investigated in a presence of the external magnetic fiel d with the help of exact diagonalization methods. It is shown that the spin-1 Heisenberg diamond cluster exhibits several remarkable quantum ground states, which are manifested in zero-and low-temperatu r e magnetization curves as intermediate plateaus at one-quarter, one-ha l f and three-quarters of the saturation magnetization. It is found that the width of the fractional magnetization plateaus depends basically on a relative strength of the coupling constants as wel l as uniaxial single-ion anisotropy, which may substantially shrink or even cause f ul l breakdown of some intermediate magnetization plateaus. It is evidenced that a relatively weak uniaxial single-ion anisotropy of the easy-axis type considerably improves a theoretical fit of low-temperature magnetization curves of the tetranuclear nickel complex [Ni-4(mu-CO3)(2)(aetpy)(8)](ClO4)(4) i n a low-field region without spoiling the previous fit based on the fully isotropic Heisenberg model in a high-field region.
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页数:3
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