Pressure Effects on T<sub>c</sub> of Superconductor YBa<sub>2</sub>Cu<sub>4</sub>O<sub>8</sub>
Y. YamadaNational Research Institute for MetalsTakehiko MatsumotoNational Research Institute for MetalsYoshinari KaiedaNational Research Institute for MetalsNobuo MôriThe Institute for Solid State Physics, The University of Tokyo
1990en
ABI
Annotatsiya
The enhancement of the superconducting transition temperature by pressure was studied up to 2 GPa for an YBa 2 Cu 4 O 8 compound which was synthesized by using the canned HIP technique. The value of d T c /d P was found to be 5.5 K/GPa. From the experiments of the specimen in which YBa 2 Cu 4 O 8 and Y 2 Ba 4 Cu 7 O 14 compounds coexist, d T c /d P for Y 2 Ba 4 Cu 7 O 14 was also shown to be 5.5 K/GPa. The result for the YBa 2 Cu 4 O 8 compound is explained by the pressure induced carrier (hole) redistribution on the basis of the calculation of the Madelung energy.
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