High Tc superconductors are well known for their complexity. Their normal state and superconducting properties have been the subject of intense research since their discovery, yet they continue to be a source of suprises for scientists working in condensed matter physics.
Using resonant inelastic X-ray scattering (RIXS), The Politecnico di Milano and CNR-SPIN teams, in collaboration with the ESRF, the Max-Planck Institute (Stuttgart), the CNR-ISC-Università di Roma La Sapienza, the Institute of Physics of Beijing (China) and other institutions, discovered a robust charge order in highly-overdoped cuprates, once again challenging common views and theories about cuprates.
The consequences of this discovery is a new regime of charge order, outside the pseudogap region of the phase diagram, which cannot be explained by theories based on a connection between pseudogap and charge order.
Principal publication and authors
Re-entrant charge order in overdoped (Bi,Pb)2.12Sr1.88CuO6+δ outside the pseudogap regime, Y.Y. Peng, R. Fumagalli, Y. Ding, M. Minola, S. Caprara, D. Betto, M. Bluscke, G.M. De Luca, K. Kummer, E. Lefrançois, M. Salluzzo, H. Suzuki, M. Le Tacon, X.J. Zhou, N.B. Brookes, B. Keimer, L. Braicovich, M. Grilli and G. Ghiringhelli, Nature Materials (11 June 2018); doi: 10.1038/s41563-018-0108-3.