Orbital order-disorder transition

These hole-rich droplets represent a ferromagnetic second phase having a 7c < 7n the volume fraction of this minority phase grows with increasing x, and in the range 0.1 < x < 0.13 the droplets are condensed into large clusters having 7c > 7n. The crossover from 7c < 7n to 7c > 7n occurs at about x = 0.10 near a point where the 2D orbital order-disorder transition (or onset of orbitally disordered clusters) at T (same T as in fig. 14) crosses Tn. 

Chalcogenides. A review has been published in which the disorder of CrS and the order-disorder transitions in Cr S and AgCrSe2 are discussed. The metal 2p- and 3s-orbital ionization potentials in Cr2S3 have been deter-... 

Intense efforts in the last decade have exhaustively mapped the electronic and superconducting properties of intercalated alkali fullerides and the occurrence of the metal-antiferromagnetic insulator transition as a function of inter -fullerene separation, orientational order/disorder, valence state, orbital degeneracy, low-symmetry distortions and metal-C60 interactions [6-12]. 

The second inaccuracy is a mix-up between cause and effect. Obviously, the two phenomena, crystal lattice distortion and low-symmetry orbital ordering, are interrelated. However, the JT distortion can take place even without any long-range orbital ordering. Above the temperature of structural (JT) phase transition, in each elementary cell, the JT effect is still active. Considered separately from one another, due to the JT effect, elementary cells can be locally distorted. These local distortions are not ordered, and respective X-ray data provide evidence of time averaged high symmetry lattice. However, above the temperature of structural phase transition, disordered JT distortions manifest themselves in XAFS [58]. 

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