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To examine the electronic phase diagram of superconducting CuO double chains,we report the effect of external pressure on the magneto-transport propertiesin superconducting and non-superconducting polycrystalline samples ofPr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta }$ at low temperatures (1.8-40 K) undervarious magnetic fields (up to 14 T). In the as-sintered non-superconductingsample, the magneto-resistance (MR) follows a power law of $H^{3/2}$ at lowtemperatures, which is in no agreement with the $H^{2}$ dependence of MR in thePrBa$_{2}$Cu$_{4}$O$_{8}$ system. The negative pressure dependence of thesuperconducting phase is qualitatively consistent with a theoretical predictionon the basis of the Tomonaga-Luttinger Liquid theory. The 48-h-reducedsuperconducting sample at ambient pressure exhibits no clear increase in MR for$T > T_{c,on}=26.5$ K. In contrast, with the application of pressure to thesuperconducting sample, the MR effects reappear and are also well fitted by$H^{3/2}$. The model of slightly warped Fermi surfaces explains not only the MReffect of the non-superconducting sample, but is also related to the reasonsfor the pressure-induced MR phenomena of the superconducting sample.

journal of the physical society of japan

Effect of pressure on magneto-transport properties in the  superconducting and normal phases of the metallic double chain compound  Pr$_{2}$Ba$_{4}$Cu$_{7}$O$_{15-\delta }$