A new spin gapless semiconductors family: Quaternary Heusler compoundsG. Z. Xu, E. K. Liu, Y. Du, G. J. Li, G. D. Liu, W. H. Wang and G. H. WuEPL, 102 1 (2013) 17007DOI: https://doi.org/10.1209/0295-5075/102/17007