Crucial role of internal collective modes in underdoped cuprates A. V. Mallik, U. K. Yadav, A. Medhi, H. R. Krishnamurthy and V. B. Shenoy EPL, 119 2 (2017) 27004 Published online: 05 October 2017 DOI: 10.1209/0295-5075/119/27004