Charge gap, lattice distortion, and ferroelastic fluctuations in high-temperature superconductors

Details Charge gap, lattice distortion, and ferroelastic fluctuations in high-temperature superconductors Charge gap, lattice distortion, and ferroelastic fluctuations in high-temperature superconductors

2010-01-23

arxiv.org/abs/1001.4152v1

Physics

Condensed Matter

Superconductivity

9 pages, REVTeX

Scientific paper

It is shown that a ferroelastic lattice distortion is associated with the superconducting transition both in low- and high-temperature superconductors. In layered tetragonal superconductors with a sufficiently high transition temperature, a ferroelastic distortion is improper and is caused by an out-of-plane charge ordering. The relation between the out-of-plane charge gap and the maximum superconducting transition temperature for these superconductors is obtained. It is shown also that the specific heat jump at the superconducting transition temperature in pnictide and cuprate superconductors is produced by ferroelastic fluctuations just below the transition temperature. The amplitude of the corresponding lattice distortion is estimated.

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