Spin and charge structures around vortices in underdoped high-temperature superconductors Guo-Qiao Zha, Ling-Feng Zhang, Hao Meng, Hong-Wei Zhao and Shi-Ping Zhou EPL, 84 1 (2008) 17005 Published online: 19 September 2008 DOI: 10.1209/0295-5075/84/17005