Large Positive Magnetoresistance of the Lightly Doped La_{2}CuO_{4} Mott Insulator

Abstract

The in-plane and out-of-plane magnetoresistance (MR) of single crystals of La_2CuO_4, lightly doped (x=0.03) with either Sr (La_{2-x}Sr_xCuO_4) or Li (La_2Cu_{1-x}Li_xO_4), have been measured in the fields applied parallel and perpendicular to the CuO_2 planes. Both La_{1.97}Sr_{0.03}CuO_4 and La_2Cu_{0.97}Li_{0.03}O_4 exhibit the emergence of a positive MR at temperatures (T) well below the spin glass (SG) transition temperature T_{sg}, where charge dynamics is also glassy. This positive MR grows as T->0 and shows hysteresis and memory. In this regime, the in-plane resistance R_{ab}(T,B) is described by a scaling function, suggesting that short-range Coulomb repulsion between two holes in the same disorder-localized state plays a key role at low T. The results highlight similarities between this magnetic material and a broad class of well-studied, nonmagnetic disordered insulators.

5+ pages, 3 figures; published version

References in corpus (7)

• Complexity in Strongly Correlated Electronic Systems
• Disorder-Driven Non-Fermi Liquid Behavior of Correlated Electrons
• Evidence for Charge Glass-like Behavior in Lightly Doped La_{2-x}Sr_{x}CuO_{4} at Low Temperatures
• Nonequilibrium Relaxations and Aging Effects in a Two-Dimensional Coulomb Glass
• Measurement of low energy charge correlations in underdoped spin-glass La-based cuprates using impedance spectroscopy
• Negative Hopping Magnetoresistance and Dimensional Crossover in Lightly Doped Cuprate Superconductors
• Glassy states in fermionic systems with strong disorder and interactions

Cited by in corpus (6)

• Skyrmions in a Doped Antiferromagnet
• Emergence of superconductivity from the dynamically heterogeneous insulating state in La_{2-x}Sr_{x}CuO_{4}
• Non-Gaussian Noise in the In-Plane Transport of Lightly Doped La_{2-x}Sr_{x}CuO_4: Evidence for a Collective State of Charge Clusters
• Anomalous Magnetoresistance due to Longitudinal Spin Fluctuations in a Jeff = 1/2 Mott Semiconductor
• Superconductivity and charge carrier localization in ultrathin $\mathbf{L}{\mathbf{a}}_{1.85}\mathbf{S}{\mathbf{r}}_{0.15}\mathbf{Cu}{\mathbf{O}}_4/\mathbf{L}{\mathbf{a}}_2\mathbf{Cu}{\mathbf{O}}_4$ bilayers
• History dependent magnetoresistance in lightly doped La_{2-x}Sr_{x}CuO_{4} thin films