Low-lying excitations and magnetization process of coupled tetrahedral systems

Article

关键词: QUANTUM SPIN CHAINS;    BOND ALTERNATION;    GROUND-STATE;    HEISENBERG-ANTIFERROMAGNET;    KAGOME LATTICE;    MODEL;    PHASE;    ORDER;    TRANSITIONS;    PLATEAUS;   

DOI  :  10.1103/PhysRevB.66.054435

来源: SCIE

【 摘 要 】

We investigate low-lying singlet and triplet excitations and the magnetization process of quasi-one-dimensional spin systems composed of tetrahedral spin clusters. For a class of such models, we found various exact low-lying excitations; some of them are responsible for the first-order transition between two different ground states formed by local singlets. Moreover, we find that there are two different kinds of magnetization plateaus which are separated by a first-order transition.

【 授权许可】

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