Anisotropy of the superconducting transition temperature under uniaxial pressure

Abstract

The superconducting transition temperature T c is calculated as a function of uniaxial pressure along the a, b, c directions for optimally doped YBa 2 Cu 3 O 7Ϫ␦ on the basis of a hole dispersion of the anisotropic t-J model. There is a good qualitative agreement with experiments. We show that the uniaxial pressure effect on T c in the ab plane is due to the anisotropies of the hole dispersion and the in-plane pairing interaction, whereas the reduction of T c under uniaxial compression along the c axis mainly results from the pressure-induced increase of hole concentration of the CuO 2 plane.

Strain-controlled critical temperature in REBa2Cu3Oy-coated conductors

“…The mechanism of the anisotropy in the uniaxial strain effects on T c along the a and b axes is not clear yet. One candidate is the model based on the van Hove singularly (VHS)19. According to Chen et al , the maximum T c possibly reflects the change in the VHS around (π, 0).…”

Strain derivatives ofTcin HgBa2CuO4+δ: The CuOWang1, Zhang2, Yan3 et al. 2014Phys. Rev. B

“…A series of uniaxial pressure and hydrostatic pressure experiments have been previously conducted on several cuprates, e.g. YBa 2 Cu 3 O 7−δ , Tl 2 Ba 2 CuO 6+δ , Hg1201 [7,[22][23][24]. dT c /dP l (l=a, b, or c) were obtained from the Ehrenfest relation.…”

An approach for studying the influence of uniaxial strain (pressure) on the temperature of the Bose–Einstein condensation of intersite bipolarons: Possible implementation for cuprates

“…Here, we continue to study the influence of strain induced by external pressure or lattice mismatch on T BEC for different lattices. Special attention will be given to the possibility of qualitative explanation of such phenomena as sign difference of the strain (pressure) derivatives of T c of [26][27][28][29][30][31]. Though the theoretical models (see above works) proposed so far were able to somehow explain the uniaxial pressure (strain) derivatives of T c of RBa 2 Cu 3 O 7−δ compounds and reproduce some aspects of the well-known experiments [32,33], they miss the important issue relevant to all cuprates.…”