Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7

I. A. Sergienko, S. H. Curnoe

It is shown that both structural phase transitions in Cd2Re2O7, which occur at T_{s1}=200 K and T_{s2}=120 K, are due to an instability of the Re tetrahedral network with respect t…