## Abstract

The pressure effect on the superconducting transition temperature (dT _{c}/dP) has been measured for Dy_{1-x}Pr_{x}Ba _{2}Cu_{3}O_{7-δ} with x=0, 0.02, 0.05, 0.1, 0.15, 0.2, and 0.3. Although the T_{c} suppression by Pr is in a different fashion for Y_{1-x}Pr_{x}Ba_{2}Cu_{3}O _{7-δ} and Dy_{1-x}Pr_{x}Ba_{2}Cu _{3}O_{7-δ}, the dT_{c}/dP is similar in these two systems, with respect to x. The measured dT_{c}/dP is positive at small x but becomes negative for x≥0.2 which is associated with the pressure effect on the normal-state resistivity (1/R)(dR/dP). The positive (1/R)(dR/dP) at x≥0.2 indicates that the number of carriers is decreasing under pressure and it supports the picture of hole localization through the hybridization of Pr-4f and O-2p bands. The mechanical pressure has a negative effect on T _{c} for x≥0.2, but chemical pressure has a positive effect on T _{c} according to the results of chemical substitution. This suggests that the large R (=rare earth element) may possibly reduce the Pr-O distance, and increase the hybridization of Pr-4f and O-2p bands.

Original language | English |
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Pages (from-to) | 5871-5873 |

Number of pages | 3 |

Journal | Journal of Applied Physics |

Volume | 73 |

Issue number | 10 |

DOIs | |

Publication status | Published - 1993 |

## All Science Journal Classification (ASJC) codes

- Physics and Astronomy(all)

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