Abstract
Through electrical resistivity measurements on CeH 2+ x , we observe first, for x⩾0.1, a structural order-disorder transition related to the excess hydrogen content x, which enters the octahedral interstitial sites. For x ⩽ 0.34, we observe Kondo effects and correlated magnetic transitions at low temperatures, which are very sensitive to the hydrogen ordering. For x ⩾ 0.4, we observe a very strong increase of all resistivity terms, i.e. residual, magnetic and phonon contributions: it indicates that there is a change of the electronic structure involving a strong decrease of the conduction electron density; but it could also be due to a percolation problem with the coexistence of metallic and nearly insulating phases.
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