Random antiferromagnetic spin-(1)/(2) chains with competing interactions

Article

关键词: QUANTUM SPIN CHAINS;    ANTI-FERROMAGNETIC CHAIN;    PEIERLS SYSTEM CUGEO3;    CRITICAL-BEHAVIOR;    GROUND-STATE;    TRANSITION;   

DOI  :  10.1103/PhysRevB.68.024425

来源: SCIE

【 摘 要 】

We study disordered antiferromagnetic spin-1/2 chains with nearest- and further-neighbor interactions using the real-space renormalization-group method. We find that the system supports two different phases, depending on the ratio of the strength between nearest-neighbor and further-neighbor interactions as well the bond randomness strength. For weak further-neighbor coupling the system is in the familiar random singlet phase, while stronger further-neighbor coupling drives the system to a large spin phase similar to that found in the study of random antiferromagnetic-ferromagnetic spin chains. The appearance of the large spin phase in the absence of ferromagnetic coupling is due to the frustration introduced by further-neighboring couplings, and is unique to the disordered chains.

【 授权许可】

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