Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.7: Vortrag
Mittwoch, 11. März 2026, 11:30–11:45, HSZ/0004
Nonlinear optical probing of a strongly correlated phase transition in epitaxial NdNiO3 thin films — •Christian Tzschaschel1,2, Felix Utsch1, Qi Song2, Spencer Doyle3, Grace A. Pan3, Julia A. Mundy3, and Stefan Eisebitt2,4 — 1Department of Physics, University of Zurich, Switzerland — 2Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Berlin, Germany — 3Department of Physics, Harvard University, USA — 4IOAP, TU Berlin, Germany
The family of rare-earth nickelates is a prime example of strongly correlated oxide materials displaying a wealth of physical phenomena from antiferromagnetism to superconductivity. NdNiO3 specifically exhibits a metal-to-insulator phase transition upon cooling that is concomitant with the emergence of antiferromagnetic order.
Here, we use nonlinear optical second harmonic generation (SHG) in the near-infrared regime to gain insight into the symmetry and ultrafast dynamics of this correlated electronic and magnetic phase transition. In static measurements, we observe a symmetry reduction from orthorhombic in the paramagnetic phase to monoclinic in the antiferromagnetically ordered phase. Upon optical excitation, we observe a quench of the SHG signal and a restoration of the orthorhombic state within 125 fs. Our study highlights the capabilities of nonlinear optics and advances the understanding of strongly correlated quantum materials.
Keywords: Ultrafast; second harmonic generation; correlated oxide; antiferromagnetism; metal-insulator transition