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Berlin 2005 – scientific programme

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M: Metallphysik

M 32: Poster TU B (Symposium Tomographic Methods in Materials Research M-32.32-55)

M 32.3: Poster

Monday, March 7, 2005, 14:30–16:30, Poster TU B

139La-NMR and the metal-nonmetal transition of lanthanum hydrides — •Sandra Heck, Stephan Leyer, and Elmar Dormann — Physikalisches Institut, Universität Karlsruhe (TH), D-76128 Karlsruhe, Germany

139La Knight shift data [1] seemed in conflict with the disappearance of the conduction electron density of states deduced from specific heat measurements [2] for increasing hydrogen content in LaHx (2≤x≤3) [3,4]. New data for Pauli susceptibility, 139 NMR line-width, line-shift and spin-lattice-relaxation are derived. Reliability of the LaCl3 in aqueous solution Knight shift standard is questioned.

A conclusive picture based on NMR is presented.

Acknowledgment: R.G. Barnes and G. Majer for samples, DFG (Do 181/12) for financial support.

[1] R.G. Barnes et al, J. Less-Comm. Metals 172-174, 411 (1991)

[2] K. Kai et al, Phys. Rev. B 40, 6591 (1989)

[3] B. Stalinski, Bull. Acad. Sci. Cl. III 5, 1001 (1957)

[4] S. Leyer et al, J.Phys. Cond. Matter 16, 6147-6158 (2004)

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