Abstract
We have synthesized a series of samples of BaPb 1− x Zr x O 3 with 0.0 ≤ x ≤ 0.25 using a solid state reaction method and performed X-ray diffraction (XRD) analysis and electrical resistance measurements on them over the temperature range 13K ≤ T < 300K. The XRD analysis indicated that the samples were nearly single phase of cubic perovskite structure. As x increased the metal-insulator (MI) transition occurred near x = 0.15. We observe the existence of the unusual “marginal metallic” state with a negative temperature coefficient and a finite zero temperature resistance over a wide temperature range. We also find a crossover between this “marginal metallic” behavior and Coulomb gap behavior as the critical region of the MI transition is approached.
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