Stability of the Local Ni${}^{2+}$ Electronic Structure to $A$-site Disorder in the Pyrochlore Antiferromagnet NaCaNi${}_2$F${}_7$

M. F. DiScala, A. de la Torre, J. W. Krizan +5

NaCaNi${}_2$F${}_7$ is a unique example of spin-1 Heisenberg antiferromagnet on the pyrochlore lattice, but the presence of Na${}^{1+}$/Ca${}^{2+}$ $A$-site disorder complicates the local…