Pressure effect on quasi-one-dimensional charge transport in ${\mathrm{PrBa}}_2{\mathrm{Cu}}_4{\mathrm{O}}_8:$ Magnetotransport study

The electrical resistivity and the magnetoresistance of ${\mathrm{PrBa}}_2{\mathrm{Cu}}_4{\mathrm{O}}_8$ have been measured under hydrostatic pressure up to 1.0 GPa. It was found that magnetoresistance is sensitive to the applied pressure below 100 K where the resistivity shows metallic behavior. This suggests that the interchain hopping energy is increased by pressure, which makes the low-temperature electronic state more two dimensional.