Work function of the mixed-valent manganese perovskites

The measurements of work function and resistivity were performed on the mixed-valent manganese perovskites. The resistivities were measured four-point on patterned bridges from the same sample used for the work function measurement. It was found that the best correlation of increased work function is to strain introduced by larger divalent ions and smaller lanthanide ions. The results show that the phase transitions are quite complex and have been resolved into a number of competing transitions into various antiferromagnetic states.