Lipkin-Meshkov-Glick model in a quantum Otto cycle Selçuk Çakmak, Ferdi Altintas and Özgür E. Müstecaplıoğlu Eur. Phys. J. Plus, 131 6 (2016) 197 Published online: 15 June 2016 DOI: 10.1140/epjp/i2016-16197-0