Ground-state magnetic properties of spin ladder-shaped quantum nanomagnet: Exact diagonalization study

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:452

Article

Szalowski, K.¹  Kowalewska, P.¹ 

[1] Univ Lodz, Dept Solid State Phys, Fac Phys & Appl Informat, Ulica Pomorska 149-153, PL-90236 Lodz, Poland

关键词: Magnetic cluster;    Nanomagnet;    Quantum spins;    Heisenberg model;    Magnetic phase diagram;    Ground state;   

DOI  :  10.1016/j.jmmm.2017.12.076

来源: Elsevier

【 摘 要 】

The paper presents a computational study of the ground-state properties of a quantum nanomagnet possessing the shape of a finite two-legged ladder composed of 12 spins S = 1/2. The system is described with isotropic quantum Heisenberg model with nearest-neighbour interleg and intraleg interactions supplemented with diagonal interleg coupling between next nearest neighbours. All the couplings can take arbitrary values. The description of the ground state is based on the exact numerical diagonalization of the Hamiltonian. The ground-state phase diagram is constructed and analysed as a function of the interactions and the external magnetic field. The ground-state energy and spin-spin correlations are extensively discussed. The cases of ferro-and antiferromagnetic couplings are compared and contrasted. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free