Help Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Electron density-of-states and the metal-insulator transition in LaHx


Majer,  Günter
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available

Barnes, R. G., Chang, C. T., Majer, G., & Kaess, U. (2003). Electron density-of-states and the metal-insulator transition in LaHx. Journal of Alloys and Compounds, 356-357, 137-141. doi:10.1016/S0925-8388(02)01221-5.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-2DA7-3
The temperature dependence of the Gd3+ impurity ion spin relaxation rate, τi−1, in lanthanum hydrides, LaHx (2.0≤x≤3.0), probes the metal–insulator (MI) transition in this system. Because Gd3+ is an S-state ion, τi−1 depends on interaction with conduction electrons in the metallic state, resulting in Korringa-type behavior, τiT=constant, and (τiT)−1/2∝N(EF), the electronic density-of-states at the Fermi level. In the non-metallic state, weak phonon processes result in a temperature dependence, τi−1∝Tn, with 3<n<5. The rate τi−1 has been measured via the Gd3+-induced contribution, R1p, to the proton spin-lattice relaxation rate, R1, by comparing the measured rate in pure LaHx with that in LaHx containing controlled low levels of Gd. The results show that in the metallic state, N(EF)∝(2.91−x)1/3, consistent with earlier results based on the 139La Knight shift which also support N(EF)∝(2.91−x)1/3.