Condensed-Matter Physics & Materials Science Seminar

"Tailoring the twinning of DyBa2Cu3O7-x thin films with atomic-layer-by-layer molecular beam epitaxy"

Presented by Daniel Putzky, Max Planck Institute for Solid State Research, Germany

Monday, August 26, 2019, 1:30 pm — ISB Bldg. 734, Conf. Rm. 201 (upstairs)

In this talk I will present the work on high-quality, epitaxial DyBa2Cu3O7-x (DBCO) thin films grown by molecular beam epitaxy (MBE). In contrast to the previous DBCO growth by MBE using co-deposition technique, we have employed an atomic-layer-by-layer shuttering sequence with in-situ RHEED feedback. Films grown on LSAT (100), NGO (110) and STO (100) have a sharp superconducting transition above 80 K. Scanning-transition electron microscopy (STEM) shows atomically sharp substrate-film interface and the absence of stacking faults, unlike films previously grown by PLD. In the second part of the talk I will focus on the structural investigation using x-ray diffraction (XRD). In-plane scans at the KARA synchrotron confirm the epitaxial relationship to the substrate. In addition the formation of twin domains with the bulk-like orthorhombic crystal structure were observed. By reducing the film thickness the tetragonal to orthorhombic phase transition can be suppressed while the films still remain superconducting.

Hosted by: Tony Valla/Ilya Drozdov

15175  |  INT/EXT  |  Events Calendar


Not all computers/devices will add this event to your calendar automatically.

A calendar event file named "calendar.ics" will be placed in your downloads location. Depending on how your device/computer is configured, you may have to locate this file and double click on it to add the event to your calendar.

Event dates, times, and locations are subject to change. Event details will not be updated automatically once you add this event to your own calendar. Check the Lab's Events Calendar to ensure that you have the latest event information.