Direct electronic structure measurements of a variety of the colossal magnetoresistive oxides show the presence of a pseudogap at the Fermi energy E_F which drastically suppresses the electron spectral function at E_F. The pseudogap is a strong function of the layer number of the samples (sample dimensionality) and is strongly temperature dependent, with the changes beginning at the ferromagnetic transition temperature T_c. These trends are consistent with the major transport trends of the CMR oxides, implying a direct relationship between the pseudogap and transport, including the "colossal" conductivity changes which occur across T_c. The k-dependence of the temperature-dependent effects indicate that the pseudogap observed in these compounds is not due to the extrinsic effects proposed by Joynt.
@article{arxiv.cond-mat/9911189,
title = {Temperature-Dependent Pseudogaps in Colossal Magnetoresistive Oxides},
author = {T. Saitoh and D. S. Dessau and Y. Moritomo and T. Kimura and Y. Tokura and N. Hamada},
journal= {arXiv preprint arXiv:cond-mat/9911189},
year = {2016}
}