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Transport studies of La_(2-x)Sr_xCuO_4 near the insulator-metal-superconductor transition

Ellman, B. and Jaeger, H. M. and Katz, D. P. and Rosenbaum, T. F. and Cooper, A. S. and Espinosa, G. P. (1989) Transport studies of La_(2-x)Sr_xCuO_4 near the insulator-metal-superconductor transition. Physical Review B, 39 (13). pp. 9012-9016. ISSN 1098-0121. doi:10.1103/PhysRevB.39.9012.

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We have measured the temperature-dependent resistivities of a series of samples of La_(2-x)Sr_xCuO_4 with 0.02≤x≤0.1 over the temperature range 0.05 K≤T≤300 K. We find the onset of superconductivity as x is increased to be correlated with a substantial drop in the magnitude of the normal-state resistivity. We observe no change, however, in the qualitative shape of the resistivity as the superconducting threshold is crossed. We also find that the low-temperature (T≤8.0 K) resistivities of the least concentrated samples can be described by variable range hopping, with a crossover between Coulomb gap and single-particle behavior occurring as x is increased.

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Alternate Title:Transport studies of La2-xSrxCuO4 near the insulator-metal-superconductor transition
Additional Information:© 1989 The American Physical Society. Received 27 October 1988. We thank J. Pluth and I. Steele for invaluable technical assistance. We have benefited from illuminating conversations with J. Kim, K. Levin, and G. Zimanyi. The work at the University of Chicago was supported by National Science Foundation Grant No. DMR 85-17478. One of us (H.M.J) acknowledges support from the Materials Research Laboratory at the University of Chicago under Grant No. DMR 85-19460.
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Issue or Number:13
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ID Code:47028
Deposited By: George Porter
Deposited On:09 Jul 2014 16:53
Last Modified:10 Nov 2021 17:33

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