Diffuse Scattering Studies of Local Correlations in ErBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> crystals
ORAL
Abstract
Understanding the origin of superconductivity is one of the greatest challenges in condensed matter physics. An outstanding question remains as to whether superconductivity is related to nematic electronic or magnetic correlations or to structural disorder. In this respect, superconducting Cuprates exhibit many imperfections at their crystallographic sites in addition to a heavily tunable oxygen vacancy framework supporting many short-range oxygen ordering schemes. In this talk, I will discuss the structural properties of five ErBa2Cu3O6+x single crystals with oxygen contents tuned to produce TC’s = 0, 22, 55, 75 and 92 K. Systematic three-dimensional reciprocal space mapping was performed at sector 6 at the Advanced Photon Source at temperatures between 30 and 300 K. We observe modulated diffuse scattering intensities arising from short-range local correlations between the Ba and Cu layers. The modulated intensities weaken upon increased doping until they disappear for the 92 K crystal. Our data provide no evidence for charge density waves which, if present, must be much weaker than those commonly observed in YBCO, LSCO or other related Cuprates.
*Work at MSD was supported by the U.S. DOE, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division.
–
Presenters
-
Bisham Poudel
- Physics, Northern Illinois University, Material Science Division, Argonne National Lab