Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 6: Complex Magnetic Oxides
MA 6.1: Vortrag
Montag, 5. September 2022, 11:00–11:15, H37
Polaronic behavior in La1.2Sr1.8Mn2O7 — •Daniel Jost1, Matteo Rossi1, Hsiao-Yu Huang2, Amol Singh2, Di-Jing Huang2, Yonghun Lee1,3, Brian Moritz1, John Mitchell4, Zhi-Xun Shen1,3,5,6, Thomas Devereaux1,7, and Wei-Sheng Lee1 — 1Stanford Institute for Materials and Energy Sciences, Menlo Park, USA — 2National Synchrotron Radiation Research Center, Hsinchu, TW — 3Department of Physics, Stanford University, Stanford, USA — 4Materials Science Division, ANL, Lemont, USA — 5Department of Applied Physics, Stanford University, USA — 6Geballe Laboratory for Advanced Materials, Stanford University, USA — 7Department of Materials Science and Engineering, Stanford Univeristy, USA
The microscopic mechanism driving colossal magneto-resistance (CMR) remains controversial. In La1.2Sr1.8Mn2O7, CMR is most pronounced at its insulator to ferromagnetic-metal transition at Tc = 120 K. In this compound, initial ARPES studies revealed the abrupt formation of quasi-particles having a strong mass renormalization below Tc, subsequently interpreted as the condensation of localized polarons into a coherent polaronic liquid. Yet, conflicting results showing finite quasi particle spectral weight above Tc cast doubt on this scenario. Here we use resonant inelastic X-ray scattering (RIXS) to investigate this controversy. In contrast to ARPES which measures the single particle spectral function, RIXS probes collective excitations directly and is thus especially suitable for the investigation of charge-lattice coupled phenomena. In this presentation, I will discuss the RIXS signatures of polarons in La1.2Sr1.8Mn2O7.