Resonance effect of direction-phase clusters in a scale-free network Yinzuo Zhou, Jie Zhou, Xingang Wang, Shuguang Guan, Choy Heng Lai and Zonghua Liu EPL, 90 3 (2010) 30005 Published online: 28 May 2010 DOI: 10.1209/0295-5075/90/30005