ISSN:
1572-9605
Keywords:
La2CuO4
;
high pressure
;
La-Ca-Cu-O
;
Y-Sr-La-Cu-O
;
oxygen pressure
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The unique coordination of the copper ions in +1, +2, and +3 oxidation states, which are stable in a range of oxygen partial pressure. 10−6〈P(O2)〈 103 atm, makes possible the formation of a wide variety of distinct structures. By controlling the oxygen pressure during the synthesis and annealing, the distribution of metal and oxygen ions can be modified on an atomic scale to optimize the structural and electronic properties. We present several examples of compounds for which the critical structural elements for superconductivity, i.e., the perfectly ordered CuO2 planes, have been obtained and doped with holes by means of high oxygen pressure,P(O2)〉1 atm. These materials, La2CuO4+δ , La2−x Ca x CuO4, and YSr2−x La x Cu3O7+δ , offer a unique opportunity to study the relationship between superconductivity and structural, magnetic, and chemical properties.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00730366
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