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Motta, Antonella |
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Azevedo, Nuno Monteiro |
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Nagengast, D. G.
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article
Quenching of Giant Hysteresis Effects in La1-zYzHx Switchable Mirrors
Abstract
The giant intrinsic hysteresis as a function of hydrogen concentration x in the optical and electrical properties of the archetypal switchable mirror YHx is eliminated by alloying Y with the chemically similar La. The La1-zYzHx films with z≤0.67 are essentially hysteresis-free. The origin of the large hysteresis of alloys with z≥0.86 is the large uniaxial lattice expansion that accompanies their fcc to hexagonal phase transition in combination with lateral clamping.