Phonon spectroscopy in FeSe using high-resolution inelastic x-ray scattering
ORAL
Abstract
We report an inelastic x-ray scattering investigation of phonons in FeSe superconductor. Comparing the experimental phonon dispersion with density functional theory (DFT) calculations in the non-magnetic state, we found a significant disagreement between them. Improved overall agreement was obtained by allowing for spin-polarization in the DFT calculations, despite the absence of magnetic order in the experiment. This calculation gives a realistic approximation of the disordered paramagnetic state of FeSe, in which strong spin fluctuations are present. We will discuss the current state of our analysis relating magnetism to the phonon dispersion.
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Presenters
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Naoki Murai
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency
Authors
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Naoki Murai
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency
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Tatsuo Fukuda
Materials Sciences Research Center, Japan Atomic Energy Agency
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Masamichi Nakajima
Department of Physics, Osaka University
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Mitsuaki Kawamura
Institute for Solid State Physics, The University of Tokyo
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Daisuke Ishikawa
Japan Synchrotron Radiation Research Institute, Materials Dynamics Laboratory, RIKEN SPring-8 Center, JASRI/SPring-8
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Setsuko Tajima
Department of Physics, Osaka University
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Alfred Q. R. Baron
RIKEN SPring-8 Center, Materials Dynamics Laboratory, RIKEN SPring-8 Center