Abstract
The effect of uniaxial stress on Tc in YBa2Cu3O7 is studied within the van Hove scenario including the interlayer coupling (3D effects). The uniaxial pressure along the a or b axis changes the in-plane anisotropy, and that along the c axis increases the interlayer coupling. Both of them change the averaged density of states and so Tc in the framework of the BCS theory. The latter effect on Tc is found to be small compared with the former, which can account for the uniaxial pressure experiment of YBa2Cu3O7.
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