April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)

Event Supporters

2024 MRS Spring Meeting
QT01.05.06

Spatially Heterogenous Structural Dynamics of NdNiO3 Thin Films

When and Where

Apr 24, 2024
4:15pm - 4:30pm
Room 420, Level 4, Summit

Presenter(s)

Co-Author(s)

Jugal Mehta1,Scott Smith1,Nanna Zhou Hagström1,Nushrat Naushin1,Spencer Jeppson1,Yu-Hsing Cheng1,Pooja Rao1,Marc Zajac2,Burak Guzelturk2,Donald Walko2,Tao Zhou2,Haidan Wen2,Martin Holt2,Roopali Kukreja2

University of California, Davis1,Argonne National Laboratory2

Abstract

Jugal Mehta1,Scott Smith1,Nanna Zhou Hagström1,Nushrat Naushin1,Spencer Jeppson1,Yu-Hsing Cheng1,Pooja Rao1,Marc Zajac2,Burak Guzelturk2,Donald Walko2,Tao Zhou2,Haidan Wen2,Martin Holt2,Roopali Kukreja2

University of California, Davis1,Argonne National Laboratory2
<i>Rare earth nickelates display insulator-metal transition which is accompanied by a magnetic transition, charge ordering, and a crystal structure change. Laser-excitation drives the transition at ultrafast timescales providing an avenue to understand the role of coupled transitions in causing the transition. We utilized time-resolved x-ray diffraction to study the structural dynamics of epitaxial NNO thin film by observing the photoinduced changes in the (002) Bragg peak. The out of plane lattice parameter contracts for low fluences and expands for high fluences after laser excitation. A thermal model explains experimental trends revealing the potential for controlling structural dynamics via heteroepitaxial strain. Similar recovery timescales of structural and magnetism dynamics indicate a strong magneto-structural coupling is prevalent in the ultrafast recovery process. The change in integrated intensity and FWHM of the (002) peak indicate photoinduced domain dynamics which corroborates an ultrafast conductivity study proposing recovery via nucleating and growth in NNO. We present direct evidence of phase separation using time-resolved nanodiffraction. Spatiotemporally resolved characterization clearly shows the spatial heterogeneity of the structural dynamics in nickelates.</i>

Keywords

quantum materials

Symposium Organizers

Ajay Ram Srimath Kandada, Wake Forest University
Nicolò Maccaferri, Umeå University
Chiara Trovatello, Columbia University
Ursula Wurstbauer, Technical University of Munich

Symposium Support

Bronze
LIGHT CONVERSION

Session Chairs

Alberto De la Torre
Chiara Trovatello

In this Session