1 / 2

Disorder and Oxygenation in Pr 2-x Ce x CuO 4- 

Disorder and Oxygenation in Pr 2-x Ce x CuO 4-  Richard L. Greene, University of Maryland, College Park, DMR 0653535. Increasing irradiation (black-red). Increasing oxygenation (black-blue-green). Increasing oxygenation (black lines). Increasing irradiation (black-red).

ginny
Download Presentation

Disorder and Oxygenation in Pr 2-x Ce x CuO 4- 

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Disorder and Oxygenation in Pr2-xCexCuO4- Richard L. Greene, University of Maryland, College Park, DMR 0653535 Increasing irradiation (black-red) Increasing oxygenation (black-blue-green) Increasing oxygenation (black lines) Increasing irradiation (black-red) Increasing oxygenation (black-purple-green) One of the important and outstanding issues in the electron doped high-Tc cuprates is the role that oxygenation plays in the superconductivity and the normal state properties. Oxygen addition can be considered both a doping and a disordering process. To disentangle these two effects, disorder can be introduced by irradiating samples without altering doping. We have studied transport properties of optimal Pr2-xCexCuO4-d (PCCO) films subject to proton irradiation and oxygenation. Our separation of the disorder and doping effects also shed light on oxygen reduction effects in electron-doped cuprates. Both oxygenation and irradiation increase the resistivity of the PCCO films and suppress Tc (Top Figure). This indicates that both processes disorder the film and lessen conduction by introducing scattering defects. However, oxygenation creates a large shift in the Hall coefficient that is comparable to a significant change in cerium doping (Middle Figure). This shift to a larger negative Hall resistivity cannot be due to a disordering effect as it is both much larger in magnitude and in the opposite direction to the irradiation induced Hall resistivity shift (Bottom Figure). Therefore, oxygen plays an important role in fixing the number of charge carriers in PCCO. More work is in progress on this subject. It seems likely that a better understanding of oxygen’s role in the electron doped cuprates could be an important piece of the high-temperature superconductivity puzzle.

  2. Disorder and Oxygenation in Pr2-xCexCuO4- Richard L. Greene, University of Maryland, College Park, DMR 0653535 Education Societal Impact Two graduate students (Joshua Higgins and Paul Bach) and one postdoc (Weiqiang Yu) contributed to this work. Dr. Yu has accepted a faculty job in China and Dr. Higgins is now a postdoc in England. Mr. Bach continues his graduate research. An understanding of the mechanism causing high temperature superconductivity may enable the development of new materials that are superconducting above room temperature. This would have a large impact on electronic devices and electricity generation and distribution.

More Related