Steric quenching of the switchable mirror effect Phys. Rev. B 75, 104109 (2007)

Details Steric quenching of the switchable mirror effect Phys. Rev. B 75, 104109 (2007) Steric quenching of the switchable mirror effect Phys. Rev. B 75, 104109 (2007)

2007-03-20

arxiv.org/abs/cond-mat/0703521v1

Phys. Rev. B 75, 104109 (2007)

Physics

Condensed Matter

Materials Science

Phys. Rev. B 75, 104109 (2007)

Scientific paper

10.1103/PhysRevB.75.104109

Scandium was substituted for yttrium to observe the effect of unit cell size on the optical metal-to-insulator (MIT) transition in the Y_(1-z)Sc_(z)H_(x) alloy system. The optical transmittance decreases significantly for z>0.10. Simultaneous electrical resistivity measurements confirm the transition from trihydride to dihydride behavior with increasing z. These observations imply a quenching of the MIT when the unit cell volume falls below a critical level that is consistent with the boundary between trihydride and non-trihydride forming rare-earth elements. A combinatoric model reveals this formation boundary corresponds to two or more Sc per unit cell.

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