Strain-induced phase transition in β-MnO2 Xing Huang, X. H. Yan, Y. Xiao, Y. D. Guo, Z. H. Zhu and C. J. Dai EPL, 99 2 (2012) 27005 Published online: 31 July 2012 DOI: 10.1209/0295-5075/99/27005