Observation of decoupling of electrons from phonon bath close to a correlation driven metal-insulator transition
Abstract
We observed that close to a Mott transition, over a small temperature range, the predominance of slow relaxations leads to decoupling of electrons from the thermal bath. This has been established by observation of large deviation of the thermal noise in the films of Mott system NdNiO3 from the canonical Johnson-Nyquist value of 4kBTR close to the transition. It is suggested that such a large noise arise from small isolated pockets of nanometric metallic phases (estimated size 15-20 nm) within the insulating phase with the charging energy as the control parameter.
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