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Measurement of low energy charge correlations in underdoped spin-glass La-based cuprates using impedance spectroscopy

Measurement of low energy charge correlations in underdoped spin-glass La-based cuprates using impedance spectroscopy

We report on the charge kinetics of ${\text{La}}_{2}{\text{CuO}}_{4}$ lightly doped with Li and Sr. Impedance spectroscopy measurements down to 25 mK and from 20 Hz to 500 kHz reveal evidence for low energy charge dynamics, which slow down with decreasing temperature. Both systems are acutely sensitive to stoichiometry. In the …