What causes metal-insulator transition in rare earth nickelate compounds?

[Ngom]

Dear everydody can you please help me to understand how can by heating your sample they jumb from Insulater state to an metal state when we rich to a certain value of temperature for exemple the Rare Earth Nickelate compounds.

Best regard
Ngom

 

[Gokul43201]

If you are referring to the perovskite nickelates (RNiO3), I can tell you that about 10 years ago, it was believed that (I think in at least some of the compounds) the transition was associated with a weak Jahn-Teller distortion. I've not followed up since then.

 

[Ngom]

Thank for the time that you use to reply to me if you have more information please let me know.

 

[Gokul43201]

Unfortunately, that's the crux of what I recall.

I think I might be able to dig up some papers on this though...but then, that's probably something that you can do as well as me.