Mr
Yi Tseng
(Photon Science Division, Paul Scherrer Institut; Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL))
Charge order (CO) and the connection to electron-phonon coupling (EPC) play crucial role in the low-energy regime of quasi-one-dimensional ladder materials. Characterizing the relevant excitations provides a direct tool to assess the underlying complex interactions. Resonant inelastic X-ray scattering (RIXS) is a powerful technique for probing phonons and its interplay with CO. We investigated the CO and optical phonon excitations in the two-leg ladder subsystem of Sr14(Cu,Co)24O41 using O K-edge RIXS and X-ray absorption spectroscopy (XAS). We infer a continuous shift of the CDW ordering towards Γ-point with Co doping, with a 5-10 meV softening of the bond-stretching phonon mode (~65 meV) at the ordering vector. This is accompanied by a reduction in the ladder hole density determined from XAS.
Mr
Yi Tseng
(Photon Science Division, Paul Scherrer Institut; Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL))
Dr
Eugenio Paris
(Photon Science Division, Paul Scherrer Institut)
Dr
Wenliang Zhang
(Photon Science Division, Paul Scherrer Institut)
Dr
Rabindranath Bag
(Indian Institute of Science Education and Research)
Dr
Vladmir N. Strocov
(Photon Science Division, Paul Scherrer Institut)
Dr
Surjeet Singh
(Indian Institute of Science Education and Research)
Prof.
Henrik M. Rønnow
(Laboratory for Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL))
Dr
Thorsten Schmitt
(Photon Science Division, Paul Scherrer Institut)
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