DQMP Forum

10.03.2026 13:00 – 14:00

Probing La1−xCaxMnO3 Thin Films at the Nanoscale
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La1−xCaxMnO3 (LCMO) is a prototypical correlated manganite showing a metal–insulator transition and
complex coupled electronic and magnetic behaviour. In this presentation, we probe LCMO thin films at
the nanoscale using complementary local techniques, including scattering-type scanning near-field optical
microscopy (s-SNOM) and magnetic force microscopy (MFM). While bulk probes such as resistivity,
SQUID, and FTIR provide spatially averaged information, local measurements give access to nanoscale
variations in optical and magnetic response. We present first results on the temperature and magneticfield
evolution of LCMO thin films and discuss how these measurements can help identify the relevant
length scales and spatial inhomogeneities near the transition.

Electronic structure of the correlated van der Waals metal
MoOCl2
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MoOCl2 is a van der Waals material characterized by a pronounced in-plane anisotropy in its electronic
and optical properties. Recent transport studies reported a high room-temperature resistivity deep in the
bad-metal regime and a Kadowaki-Woods ratio exceeding that of heavy fermions, typical signatures of
strongly correlated metals [1]. At the same time, MoOCl2 was shown to sustain long-lived hyperbolic
plasmon polaritons, modes typically associated with coherent charge dynamics in metals [2]. In this
talk, I will present a detailed investigation of the electronic structure of MoOCl2 using micro-ARPES.
Our measurements confirm the strong electronic anisotropy. However, a comparison with DFT shows
evidence for weak to moderate electronic correlations, in contrast to the transport results. Interestingly,
the renormalization of the quasiparticle dispersion varies strongly along the Fermi surface, implying nonlocal
interactions, which we mostly attribute to the dimerization of Mo.

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Bâtiment: Ecole de Physique

Auditoire Stückelberg

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