Irreversible work and internal friction in a quantum Otto cycle of a single arbitrary spin Selçuk Çakmak, Ferdi Altintas, Azmi Gençten and Özgür E. Müstecaplıoğlu Eur. Phys. J. D, 71 3 (2017) 75 Published online: 28 March 2017 DOI: 10.1140/epjd/e2017-70443-1