Universal Charge Order in the Cuprate High-Tc Superconductors

Dr. Eduardo H. da Silva Neto (host Kelton), University of California, Davis
April 30, 2018 at 4:00 pm
241 Compton
Event Description 

It has long been speculated that copper-based (cuprate) high-temperature superconductors, or the knowledge gained from studying them, could be a path to room-temperature superconductivity, which would revolutionize everyday technology. Short of that, studying these materials advances our understanding about the collective quantum mechanical behavior of particles, one of the fundamental challenges in contemporary modern physics. Although studies of the cuprates now span more than three decades, the more recent discovery, in one of the cuprate families (YBa2Cu3O6+x), of a phenomenon known as charge order (CO) revealed that an important piece of the high-Tc puzzle was missing, resulting in a re-focused effort to study the cuprates. In this talk, I will discuss a series of experiments [2-5] that use multiple measurement tools such as scanning tunneling microsocopy and spectroscopy (STM/S) and resonant x-ray scattering (RXS) to discover and visualize the CO in different cuprate families. We find that this CO phenomenon emerges below a certain temperature, as specific electronic orbital states form new spatial patterns that are unrelated to the underlying position of the atoms in the crystals. Our series of studies establish the basic phenomenology of the CO as a function of doping, temperature and magnetic fields in different cuprate families, allowing us to investigate its consequences to the other cuprate properties: superconductivity, magnetism and the mysterious pseudogap phase.

  1. G. Ghiringhelli, et al. Science 337, 821 (2012).
  2. E. H. da Silva Neto, et al. Science 343, 393 (2014).
  3. E. H. da Silva Neto, et al. Science 347, 282 (2015).
  4. E. H. da Silva Neto, et al. Science Advances 2 (8), e1600782 (2016).
  5. E. H. da Silva Neto, et al. in preparation (2018).

Coffee: 3:45 pm, 241 Compton