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Resonant Inelastic ...
Resonant Inelastic X-ray Scattering Studies on Quasi-Two-Dimensional Superconducting Materials
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- John Mukkattukavil, Deepak, 1993- (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik,Energimaterialens fysik,Department of Physics and Astronomy, X-ray Photon Science
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- Rubensson, Jan-Erik, Prof. (thesis advisor)
- Uppsala universitet,Kemisk och biomolekylär fysik,Energimaterialens fysik
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- Agåker, Marcus, Dr. (thesis advisor)
- Uppsala universitet,Kemisk och biomolekylär fysik,Energimaterialens fysik
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- Sassa, Yasmine, Asst. Prof. (thesis advisor)
- Materials Physics, Department of Physics, Chalmers University of Technology
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- Såthe, Conny, Dr. (thesis advisor)
- MAX IV Laboratory, Lund University
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- Thiagarajan, Balasubramanian, Dr. (opponent)
- MAX IV Laboratory, Lund University
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(creator_code:org_t)
- ISBN 9789151315416
- Uppsala : Uppsala University, 2022
- English 111 s.
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Series: Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, 1651-6214 ; 2163
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Abstract
Subject headings
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- Unconventional superconductivity is one of the many fascinating research areas of condensed matter physics. Understanding the superconducting pairing mechanism and its connection with other competing states remains unclear. This thesis investigates electronic transitions, charge, and spin fluctuations of various single-crystalline superconductors using a combination of x-ray absorption, x-ray emission, and resonant inelastic x-ray scattering techniques. Room temperature x-ray absorption, x-ray emission, and partial fluorescence yield measurements were carried out on LaPt2Si2 single crystal at the Si 2p and La 4d edges. Atomic-like transitions from La 4d to 4f are observed in x-ray absorption and x-ray emission measurements. The x-ray emission spectrum of LaPt2Si2 at the Si 2p edge is compared to the Si p and d local partial density of states. Resonant inelastic x-ray scattering measurements on YFe2Ge2 single crystal are also presented in this thesis. Magnon dispersion in YFe2Ge2 crystal along (h,0) and (h,h) directions are extracted from resonant inelastic x-ray scattering spectra and inelastic neutron scattering experiments. The magnon dispersion is fitted with the dispersion relation for a square lattice using the nearest and next-nearest neighbor exchange interaction. In YFe2Ge2, the ferromagnetic exchange interaction is higher than the antiferromagnetic interaction. High-resolution resonant inelastic x-ray scattering spectra were measured on La1.675Eu0.2Sr0.125CuO4 superconductor at various temperatures. Charge density fluctuations with shorter correlation lengths have been shown to exist above the structural transition up to 200 K in La1.675Eu0.2Sr0.125CuO4. Phonon dispersion relation has also been mapped from high-resolution resonant inelastic x-ray scattering spectra. Softening of optical phonon mode in La1.675Eu0.2Sr0.125CuO4 is observed at low and high temperatures coinciding with the charge density wave vector.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Keyword
- Resonant inelastic x-ray scattering
- Superconductivity
- Crystal
- Magnon
- Phonon
- Physics with spec. in Atomic, Molecular and Condensed Matter Physics
- Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik
Publication and Content Type
- vet (subject category)
- dok (subject category)
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