Pressure dependence of the superconducting critical temperature of the Tl0.5Pb0.5Sr2Ca1-xYxCu2O7 system
Journal
Physical Review B
Journal Volume
55
Journal Issue
17
Pages
11832-11838
Date Issued
1997
Author(s)
Abstract
Using a cryogenic diamond anvil cell the pressure dependence of the superconducting transition temperature (Formula presented) of (Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented)(Formula presented) for x=0.0, n0.1, n0.2, and 0.35 has been measured resistively up to ∼20 GPa. In high-(Formula presented) superconductors there are two contributions to the pressure dependence of (Formula presented): one related to pressure-induced charge transfer and one due to intrinsic effects. In the present experiment these contributions could be separated using a simple phenomenological model which incorporates the effect of changes in both the yttrium content x and the applied pressure p on (Formula presented). In this system it is found that there hardly is any charge transfer by pressure so that the intrinsic pressure effect is the main contribution to ∂(Formula presented)/∂p. The maximum (Formula presented) which can be reached in this system is 112 K. © 1997 The American Physical Society.
Type
journal article