Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.32: Poster

Wednesday, September 7, 2022, 16:00–18:00, P3

Lattice dynamics in tuneable thin films with Ruddlesden-Popper structure — •Veronica Goian¹, Natalie Dawley², Jingshu Zhang², Christelle Kadlec¹, Nathan D. Orloff³, Reinhard Uecker⁴, Steffen Ganschow⁴, Darrell G. Schlom^2,5, and Stanislav Kamba¹ — ¹Institute of Physics ASCR, Prague, Czech Republic — ²Department of Materials Science and Engineering, Cornell University, Ithaca, NY, USA — ³National Institute of Standards and Technology, Boulder, CO, USA — ⁴Leibniz-Institut für Kristallzüchtung, Berlin, Germany — ⁵Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, USA

In this work, we will compare the phonon dynamics of (SrTiO₃)₆SrO (SrRP6) thin film with (SrTiO₃)₅(BaTiO₃)₁SrO (BaRP6) and Sr_5/6Ba_1/6TiO₃ (SBT) thin films, all deposited on (110)DyScO₃ substrates. The XRD measurements and the rocking curves prove the thin films are single phase and epitaxially grown on the substrates. The lattice dynamics of the thin films were determined using THz and IR spectroscopies down to 10 K. Many phonons exhibit anomalies near temperatures of the ferroelectric phase transitions. We found out that the 100 nm BaRP6 and SBT thin films have T_C about 40-50 K higher than previously studied 50 nm thin films, which is due to slightly relaxed strain in the thin films. We will also compare the temperature behavior of the complex permittivity of BaRP6 and SBT thin films with behavior of Ba_xSr_1−xTiO₃ (x=0.1..0.6) ceramics and will discuss the reason for high tuneability of permittivity and low dielectric loss in strained thin films.