STM imaging of inversion-symmetry-breaking structural distortion in the Bi-based cuprate superconductors

Details STM imaging of inversion-symmetry-breaking structural distortion in the Bi-based cuprate superconductors STM imaging of inversion-symmetry-breaking structural distortion in the Bi-based cuprate superconductors

2011-04-21

arxiv.org/abs/1104.4342v1

Physics

Condensed Matter

Superconductivity

4 figures

Scientific paper

We use scanning tunneling microscopy to image an orthorhombic structural distortion across the cuprate superconducting Bi2Sr2Can-1CunO2n+4+x family tree. We find the surface BiO plane to consist of two Bi sublattices, shifted by about one percent of the unit cell along the orthorhombic a-axis, breaking inversion symmetry at the Cu site, but preserving a mirror plane along this a-axis. We track the structure as a function of doping, temperature and magnetic field, but find no dependence of the magnitude of the shift on these parameters. Most importantly, we image twin boundaries in this structural distortion, providing a clear local picture of the preserved and broken mirror symmetries of the structural unit cell.

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