Abstract
The oxygen isotope effect was studied in the system () for x=0.2, 0.3, 0.4, and 0.5. It is found that the oxygen isotope exponent α increases with increasing x and therefore decreasing transition temperature . For the highest Pr concentrations α tends toward α=0.5. The value of the isotope exponent depends on the concentration of mobile holes. The lower this concentration is, the larger becomes the isotope exponent.
- Received 3 December 1990
DOI:https://doi.org/10.1103/PhysRevB.44.5318
©1991 American Physical Society