Abstract
The hydrostatic pressure effects on the superconducting transition temperatures of the oxycarbonate cuprates have been determined for and 4 with different dopings of ’s. We found that, similar to depends strongly on x for (Cu,C)-1223 and increases from to as x decreases and the compound changes from overdoped to nearly optimally doped, consistent with the prediction of the phenomenological model on the pressure effect on In contrast to the prediction, depends only slightly on x for (Cu,C)-1234 and decreases from to as x decreases from nearly optimally doped to underdoped. The difference is attributed to the possible different electronic contribution of the CuO chains in the two compounds, as implied by the distinct temperature dependences of their thermoelectric power.
- Received 8 September 1999
DOI:https://doi.org/10.1103/PhysRevB.61.6408
©2000 American Physical Society