Effect of Ta(5+) Substitution on the Ground State of CMR Manganites
  In this paper, we discuss the most deleterious effect of charge state modification at the Mn site on the ground state of the CMR manganites. 
L. Seetha Lakshmi, K. Doerr, K. Nenkov, A. Handstein, V. Sridharan, V.   S. Sastry and K. -H. Mueller