Suppression of superconductivity in the R(Ba{sub 1{minus}z}R{sub z}){sub 2}Cu{sub 3}O{sub 7+{delta}} (R=Pr,Nd) system
- Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011 (United States)
- Tata Institute of Fundamental Research, Bombay 400005 (India)
- University of Missouri Research Reactor, Columbia, Missouri 65211 (United States)
Structural and superconducting behavior of samples prepared with the nominal compositions of Nd{sub 1.05}(Ba{sub 1{minus}z}Pr{sub z}){sub 1.95}Cu{sub 3}O{sub 7+{delta}} has been investigated by neutron-diffraction and dc magnetization measurements. Neutron data refined by the Reitveld method showed that there is mixing of the rare-earth (R) ions with a substantial fraction of the Pr going to the normal R site in the RBa{sub 2}Cu{sub 3}O{sub 7+{delta}}-type structure and a corresponding fraction of the Nd going to the Ba site. Structural changes due to the trivalent R ions going to the Ba site are very similar to those observed in the Nd{sub 1+x}Ba{sub 2{minus}x}Cu{sub 3}O{sub 7+{delta}} (Nd123ss), indicating that Pr behaves like other trivalent R{close_quote}s on the divalent Ba site. Magnetization measurements show that the depression in T{sub c} is more pronounced for the Pr bearing samples than that for Nd123ss for the same number of trivalent ions on the Ba site. However, by correcting the changes in T{sub c} for the depression associated with the fraction of Pr on the R site, the depression in T{sub c} per trivalent ion on the divalent site is found to be identical to that in other light R123ss. Thus the depression in superconductivity in this series of samples is due to two independent effects: (1) Pr on the R site and (2) hole localization due to trivalent R ions on the Ba site. In this respect, Pr on the Ba site appears to behave like all the other trivalent R ions. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Purdue Univ., West Lafayette, IN (United States)
- DOE Contract Number:
- FG02-90ER45427; W-7405-ENG-82
- OSTI ID:
- 538579
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 56, Issue 9; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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