Veranstaltungsankündigung als pdf-Download (https://tu-dresden.d e/mn/physik/ressourcen/dateien/physikalisches-kolloquium/2022-01-25-Phys_K olloq-LeTacon-WS2021.pdf).
Kurzfassung: Transi tion metal compounds in which electrons from partially filled d-shells str ongly interact with each other keep challenging the standard theory of sol ids as new\, emergent exotic electronic orders are experimentally observed . Despite vastly different macroscopic properties\, e.g.\, high temperatur e superconductivity (HTS)\, electronic nematicity or density waves to cite a few\, the electronic phases encountered in these quantum materials can be almost degenerate and compete with each other within complex phase diag rams. The crystal lattice is more than a mere spectator. It can be used to tune the subtle interplay between charge\, spin\, orbital and lattice deg rees of freedom that controls such competing electronic states and thereby to learn more about the microscopic mechanisms underpinning their stabili zation. In the first part of this talk\, I will show how the combination of pressure (hydrostatic or uniaxial) tuning and x-ray spectroscopy has be en used in the course of the last decade to gain fresh insights on the pro perties of charge density waves (CDW) in high temperature superconducting cuprates [1-3]. The second part of the talk\, I will focus on BaNi2As2\, w hich can be seen a non-magnetic analogue of the parent compound of Fe- bas ed superconductors. In this material incommensurate and commensurate CDW h ave been recently reported and yield a new form of electronic nematicity w hich strongly couples to the crystal lattice.
[1] S. M. Souliou\ , et al. Phys. Rev. B 97 020503 (2018). / [2] H. H. Kim\, S. M. Soulio u et al. Science 362 1040 (2018). / [3] H. H. Kim\, et al. Phys. Rev. Lett. 126 037002 (2021).
Biographie: Matthi eu Le Tacon studied Physics at the University Paris-Sud (Orsay) and receiv ed his PhD from University Paris Diderot under the supervision of Alain Sa cuto in 2006 investigating the charge dynamics of Hg-based cuprates using light scattering. After a post-doc at the European Synchrotron Research Fa cility where he familiarized himself with inelastic x-ray scattering\, he was appointed in 2009 as leader of the inelastic photon scattering group i n the department headed by Berhnard Keimer at the Max Planck Institute for the Solid-State Research. In May 2016\, he became professor and director of the Institute for Solid State Physics at the Karlsruhe Institute of Tec hnology. In 2020\, he founded the Institute for Quantum Materials and Tech nologies.
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