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Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Toru Sakai 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 distorted diamond quantum spin chain with the Ising-like anisotropic ferromagnetic interaction is investigated using the numerical diagonalization method. Two kinds of wide magnetization plateaux are found at 1=3 of the saturation magnetization based on the Haldane-like mechanism and the Néel-like mechanism, respectively. Apart from the magnetization plateaux, there appear the conventional Tomonaga-Luttinger liquid (TLL) phase and the two-magnon TLL phase. The latter phase is composed of the nematic TLL phase and the SDW TLL phase. The phase diagram with respect to the ferromagnetic interaction anisotropy parameter versus the magnetization is presented.
Toru Sakai,Masaru Hashimoto,Tomoki Houda,Rito Furuchi,Hiroki Nakano,Kiyomi Okamoto,Kouichi Okunishi 한국물리학회 2023 새물리 Vol.73 No.12
The magnetization process of the S = 1=2 ferromagnetic and antiferromagnetic bond-alternating chain with competing anisotropies is investigated using the numerical diagonalization of finite-size systems. It is found that when the easy-plane and easy-axis anisotropies are introduced at the ferromagnetic and antiferromagnetic bonds, respectively, the system possibly exhibits the 1/2 magnetization plateau with the spontaneous translational symmetry breaking. The phase diagrams with respect to the two anisotropies are presented.