Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects I (joint session TT/DS/MA)

TT 39.6: Vortrag

Mittwoch, 11. März 2026, 12:15–12:30, HSZ/0003

Investigation of Ruddlesden-Popper nickelates and the monolayer-trilayer polymorph using Raman spectroscopy — •Vignesh Sundaramurthy¹, Abhi Suthar¹, Pascal Puphal^1,2, Hasan Yilmaz³, Masahiko Isobe¹, Matteo Minola¹, Bernhard Keimer¹, and Matthias Hepting¹ — ¹Max-Planck-Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany — ²2^nd Physics Institute, University of Stuttgart, 70569 Stuttgart, Germany — ³University of Stuttgart, Institute for Materials Science, Materials Synthesis Group, Heisenbergstraße 3, 70569 Stuttgart, Germany

Ruddlesden-Popper nickelates have attracted intense interest following the discovery of superconductivity in several members of the series, including bilayer La₃Ni₂O₇, trilayer La₄Ni₃O₁₀, and structural polymorphs composed of monolayer-bilayer or monolayer-trilayer (ML-TL) units. In this talk, we explore the phononic and electronic Raman responses of high-quality ML-TL single crystals and contrast them with those of the other nickelate phases, using samples with optimized oxygen content.

Keywords: Ruddlsden-Popper nickelates; Polymorphs; Raman Spectroscopy