Geometric discord of the Jaynes-Cummings model: pure dephasing regime Sina Hamedani Raja, Hamidreza Mohammadi and Seyed Javad Akhtarshenas Eur. Phys. J. D, 69 1 (2015) 14 Published online: 13 January 2015 DOI: 10.1140/epjd/e2014-50203-7