CJT transition on the resistivity

In the CJT state below 269 K, the sample shows antiferrodistorsive order (see Fig. 1) in which all eg electrons occupy 3z2 — r2 orbitals. This confines the charge carriers within the oh-plane, since movement perpendicular to this plane is impossible due to a lack of suitable orbitals. In this state, transport is therefore mainly two-dimensional. The probability for orbital overlap within the plane is 

The major difference in the ordered CJT phase is the suppression of conductivity along the c-direction. Due to the antiferrodistorsive order, two steps are required on average to span a distance of one unit cell along the two remaining principal axes, 

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