Abstract
Measurements of the linear thermal expansion coefficients α i at the superconducting transition temperature T c and measurements of the hydrostatic pressure dependence d T c/d P of high-quality single crystals of Sm 2− x Ce x CuO 4− y are presented. The uniaxial stress dependencies d T c/d σ i are deduced thermodynamically from the observed discontinuous changes in α i at T c. The uniaxial stress effects along the a and c crystallographic directions are d T c/d σ a =−5.78±1.6 K/GPa and d T c/d σ c =+11.66±3.5 K/GPa, respectively. Their sum agrees well with the measured d T c/d P near zero. Thus, a decrease in the interlayer spacing is found to have a strong positive affect on T c, and a decrease in the intralayer atomic spacing has a strong negative influence on T c.
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