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Departamento de Física de la Materia Condensada

Seminario: "High magnetic field STM to visualize electronic correlations"

High magnetic field STM to visualize electronic correlations
Dpto. de Física de la Materia Condensada
Profesora Isabel Guillamón, Facultad de Ciencias, UAM
Evento online, MS-TEAMS, “Seminarios del Departamento”

Electronic systems showing emergent phenomena generally present varied phase diagrams with intertwined phases Of great interest are the new electronic phases favouring the emergence of high critical temperature HTc superconductivity, in particular close to a quantum critical point Among these, charge density waves, antiferromagnetism and, most recently, nematic order, are identified ubiquitously in relation to superconductivity Fe based superconductivity offers ultra pure materials easily tunable through relevant phases emerging from electron correlations antiferromagnetism nematicity and superconductivity), providing a tremendous opportunity to unveil the microscopic pairing mechanism behind HTc superconductivity These phases have different associated length scales and produce intrinsic spatially varying electronic behaviour when the material is tuned to the quantum critical point Therefore, addressing the problem of electron correlations requires powerful microscopes probing electronic properties down to atomic scale On the other hand, high magnetic fields are needed to disentangle the electronic correlations, because they enable comparison between normal and superconducting phases and unveil quantum critical behavior and vortex physics.

In this seminar, I will show the recent efforts made in STM for very high magnetic fields, presenting first spectroscopic data taken above 20 T. I will introduce open questions around HTc superconductivity, in particular, in the family of Fe based superconductors Then I will discuss results in different systems where superconductivity coexists with magnetism (Ni doped CaKFe 4 As 4 nematicity FeSe or both (P substitute BaFe 2 As 2 showing how the superconducting properties are modified by changes in the lectronic correlations in the proximity to a quantum critical point.


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