Disorder induced critical phenomena in magnetically glassy Cu-Al-Mn   alloys
  Measurements of magnetic hysteresis loops in Cu-Al-Mn alloys of different Mn content at low temperatures are presented. The loops are smooth and continuous above a certain temperature, but exhibit a magnetization discontinuity below that temperature. Scaling analysis suggest that this system displays a disorder induced phase transition line. Measurements allow to determine the critical exponents $\beta=0.03\pm 0.01$ and $\beta \delta = 0.4 \pm 0.1$ in agreement with those reported recently [Berger et al., Phys. Rev. Lett. {\bf 85}, 4176 (2000)] 
Jordi Marcos, Eduard Vives, Lluis Manosa, Mehmet Acet, Eyup Duman,   Michel Morin, Vaclav Novak and Antoni Planes