Charge order and suppression of superconductivity in HgBa2CuO4 at high pressures

• Main Authors: Izquierdo, Manuel, Freitas, Daniele C, Colson, Dorothée, Garbarino, Gastón, Forget, Anne, Megtert, Stephan, Raffy, Helène, Comes, Robert, Itié, Jean-Paul, Ravy, Sylvain, Fertey, Pierre, Núñez-Regueiro, Manuel
• Format: Journal Article
• Language: English
• Published: 13-10-2015
• Subjects: Physics - Superconductivity
• DOI: 10.48550/arxiv.1510.03750

Condens. Matter 2021, 6, 25 New insight into the superconducting properties of HgBa2CuO4 (Hg-1201)
cuprates is provided by combined measurements of the electrical resistivity and
single crystal X-ray diffraction under pressure. The changes induced by
increasing pressure up to 20GPa in optimally doped single crystals were
investigated. The resistivity measurements as a function of temperature show a
metallic behavior up to ~10GPa that gradually passes to an insulating state,
typical of charge ordering, that totally suppresses superconductivity above
13GPa. The changes in resistivity are accompanied by the apparition of sharp
Bragg peaks in the X-ray diffraction patterns indicating that the charge
ordering is accompanied by a 3D oxygen ordering appearing at 10GPa of
wavevector [0.25, 0, L]. As pressure induces a charge transfer of about 0.02 at
10GPa, our results are the first observation of charge order competing with
superconductivity that develops in the over-doped region of the phase diagram
of a cuprate.