Pressure effect on the superconducting transition temperature of Dy1−xPrxBa2Cu3O7−δ : 37th Annual conference on magnetism and magnetic materials
Lin, J. G. ; Xue, Y. Y. ; Chu, C. W. ; Cao, X. W. ; Ho, J. C.
[S.l.] : American Institute of Physics (AIP)
Published 1993
[S.l.] : American Institute of Physics (AIP)
Published 1993
| ISSN: |
1089-7550
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
The pressure effect on the superconducting transition temperature (dTc/dP) has been measured for Dy1−xPrxBa2Cu3O7−δ with x=0, 0.02, 0.05, 0.1, 0.15, 0.2, and 0.3. Although the Tc suppression by Pr is in a different fashion for Y1−xPrxBa2Cu3O7−δ and Dy1−xPrxBa2Cu3O7−δ, the dTc/dP is similar in these two systems, with respect to x. The measured dTc/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 Tc for x≥0.2, but chemical pressure has a positive effect on Tc 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.
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| Type of Medium: |
Electronic Resource
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| URL: |