Low energy magnetic dynamics of Sr2IrO4
Strontium iridate, Sr2IrO4, has recently received special attention due to its close resemblance to the undoped high-TC cuprates in terms of structural, electronic, and magnetic aspects. We have measured the spin-wave dispersion of Sr2IrO4 using the resonant inelastic x-ray scattering (RIXS) technique, which revealed a magnon branch with a bandwidth of ~200 meV. Intriguingly, our very recent Raman spectroscopy data reveals the emergence of additional magnetic modes at between 0 and 10 meV. This mode has a magnetic field dependence distinct from that of the magnon, and we suspect that it may be related to recently reported hidden odd-parity order. We propose to utilize the cold neutron spectrometer ThALES in order to access this energy regime and study the magnetic nature of the excitation spectrum around the magnetic zone center and zone boundary, with the objective of elucidating the nature of the hidden order and developing a comprehensive description of the magnetic dynamics and a better understanding of the link between Sr2IrO4 and the high-TC cuprates.
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J Bertinshaw; KIM Bumjoon; PORRAS PEREZ GUERRERO Juan Pablo and STEFFENS Paul. (2016). Low energy magnetic dynamics of Sr2IrO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1517
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