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Charge and Heat Transport Phenomena in Electronic and Spin Structures in B20-type Compounds electronic resource by Naoya Kanazawa.

By: Kanazawa, Naoya [author.]Contributor(s): SpringerLink (Online service)Material type: TextTextSeries: Springer Theses, Recognizing Outstanding Ph.D. ResearchPublication details: Tokyo : Springer Japan : Imprint: Springer, 2015Edition: 1st ed. 2015Description: XII, 89 p. 60 illus., 52 illus. in color. online resourceContent type: text Media type: computer Carrier type: online resourceISBN: 9784431556602Subject(s): physics | Phase transformations (Statistical physics) | Condensed materials | Condensed matter | Superconductivity | Superconductors | Surfaces (Physics) | Interfaces (Physical sciences) | Thin films | Materials -- Surfaces | Physics | Strongly Correlated Systems, Superconductivity | Surface and Interface Science, Thin Films | Quantum Gases and Condensates | Surfaces and Interfaces, Thin FilmsDDC classification: 530.41 LOC classification: QC611.9-611.98Online resources: Click here to access online
Contents:
Introduction -- Experimental methods -- Magnetic and transport properties in B20-type germanides -- 3D skyrmion-lattice and topological Hall effect in MnGe -- Skyrmion formation in epitaxial FeGe thin films -- 3D Dirac electrons and large thermoelectric properties in CoGe -- Conclusion.
In: Springer eBooksSummary: This thesis presents systematic experimental research on chiral-lattice crystals referred to as B20-type germanium compounds, especially focusing on skyrmion spin textures and Dirac electrons. An emergent electromagnetic field observed in MnGe demonstrates a formation of three-dimensional skyrmion crystals. Detection of skyrmions in nanoscale Hall bar devices made of FeGe is realized by measuring the topological Hall effect, a transport property reflecting emergent fields produced by skyrmions. By measuring the electron-filling dependence of thermopower in CoGe, a pronounced thermoelectric property in this compound is revealed to stem from the asymmetric density of states appearing at certain levels of Fermi energy in the Dirac electron state. The three main results named above will contribute to enriching a variety of novel electromagnetic responses of emergent gauge fields in solids, to realizing high-performance skyrmion-based magnetic memory, and to designing high-efficiency thermoelectric materials, respectively.
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Introduction -- Experimental methods -- Magnetic and transport properties in B20-type germanides -- 3D skyrmion-lattice and topological Hall effect in MnGe -- Skyrmion formation in epitaxial FeGe thin films -- 3D Dirac electrons and large thermoelectric properties in CoGe -- Conclusion.

This thesis presents systematic experimental research on chiral-lattice crystals referred to as B20-type germanium compounds, especially focusing on skyrmion spin textures and Dirac electrons. An emergent electromagnetic field observed in MnGe demonstrates a formation of three-dimensional skyrmion crystals. Detection of skyrmions in nanoscale Hall bar devices made of FeGe is realized by measuring the topological Hall effect, a transport property reflecting emergent fields produced by skyrmions. By measuring the electron-filling dependence of thermopower in CoGe, a pronounced thermoelectric property in this compound is revealed to stem from the asymmetric density of states appearing at certain levels of Fermi energy in the Dirac electron state. The three main results named above will contribute to enriching a variety of novel electromagnetic responses of emergent gauge fields in solids, to realizing high-performance skyrmion-based magnetic memory, and to designing high-efficiency thermoelectric materials, respectively.

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