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Electrical transport properties of dense bulk YBa2Cu4O8 produced by hot isostatic pressing |
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| Authors: | BM Andersson B Sundqvist J Niska B Loberg K Easterling |
| Institution: | Department of Physics, Umeå University, S-90187, Umeå, Sweden Department of Engineering Materials, Luleå University of Technology, S-95187, Luleå, Sweden |
| Abstract: | Highly dense sintered YBa2Cu4O8 has been produced by hot isostatic pressing (HIP). The electrical resistivity  of this material has been measured as a function of temperature T and pressure in the range 40–650 K and 0–0.7 GPa. Both the temperature dependence and the pressure dependence of are found to be well described by a model based on the standard Bloch-Grüneisen theory. It is pointed out that is liner in T only under isobaric conditions, while is strongly nonlinear in all high-Tc superconductors under isochoric (constant volume) conditions. The critical current density of the material is 900 A/cm2 at 4 K, while the resistivity is 630 μΩ cm at 294 K. |
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