The relationship of structure to superconductivity in the Pr-Ba-Cu-O system
- Iowa State Univ., Ames, IA (United States)
The relation of structure to lack of superconductivity in Pr-Ba-Cu-O was systematically investigated. First, the phase equilibria of this system was studied to find the processing parameters which maximize the cation-site ordering between Pr and Ba ions. Second, a comparative study between superconducting Nd-Ba-Cu-0 and non- superconducting Pr-Ba-Cu-0 was performed by forming solid-solution Nd- Pr-Ba-Cu-0. The relation between structure and superconductivity in Ndb1-xPrxBa2Cu3O7-δ is investigated. Tc decreases monotonically with increasing x and superconductivity disappears at around x=0.3-0.4. Tc is enhanced by 10K when the sample is processed at an oxygen partial pressure (PO2) of 0.01 atm, followed by oxygenation at 450C. Depression of (Tc) as a function of x and PO 2 is explained in terms of a charge-transfer model. It is suggested that destruction of superconductivity in the RE1-xPrxBa2CU3O7-δ (RE=rare-earth) system can be viewed as disruption of four-fold planar coordinated Cu ions in the chain-site due to permanent occupation of extra Pr ions on Ba sites.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 10161809
- Report Number(s):
- IS-T-1707; ON: DE94014231
- Resource Relation:
- Other Information: TH: Thesis (M.S.); PBD: 10 May 1994
- Country of Publication:
- United States
- Language:
- English
Similar Records
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
Superconductivity of the Pr-substituted (Nd/sub 1-x/Pr/sub x/)Ba/sub 2/Cu/sub 3/O/sub 7-/delta// system