Non-linear electronic transport and anomalous resistance fluctuations in the stripes state of $La_2NiO_{4.14}$

TL;DR

This study investigates the non-linear electronic transport and resistance fluctuations in the stripe-ordered phase of La2NiO4.14, revealing macroscopic charge freezing and complex fluctuation behaviors linked to stripe states.

Contribution

It provides new experimental insights into the transport properties and resistance fluctuations associated with stripe order in La2NiO4.14, highlighting non-Ohmic behavior and charge freezing phenomena.

Findings

Observation of non-Ohmic and hysteretic V(I) curves below 220 K.

Detection of large, non-Gaussian resistance fluctuations with cooling rate dependence.

Identification of resistance jumps indicating macroscopic charge freezing below 100 K.

Abstract

We report on electronic transport measurements in $La_2NiO_{4.14}$. Non-Ohmic and hysteretic $V(I)$ curves are measured for $T \lesssim$ 220 $K$. Large and non Gaussian resistance fluctuations can be observed, with strong cooling rate dependence. During a slow cooling, the resistance reaches plateaus and then suddenly jumps for $T \lesssim$ 100 $K$, evidencing a macroscopic freezing of the charges. Anti-correlation between time-series of orthogonal resistances is also observed. These results are discussed in the framework of the stripes state scenario.