Phase-controlled optical Kerr effect in a microwave-driven X-type atomic system Zubair Iqbal Dar, Amanjot Kaur, Neeraj Singh, Sandeep Kumar and Paramjit Kaur Eur. Phys. J. Plus, 136 3 (2021) 309 Published online: 11 March 2021 DOI: 10.1140/epjp/s13360-021-01301-6