Charge and Heat Transport Phenomena in Electronic and Spin Structures in B20-type Compounds

Naoya Kanazawa (Autor)

Buch | Softcover

89 Seiten

2016 | Softcover reprint of the original 1st ed. 2015
Springer Verlag, Japan
978-4-431-56306-8 (ISBN)

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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.

Dr.Naoya Kanazawa Department of Applied Physics, University of Tokyo kanazawa@ap.t.u-tokyo.ac.jp

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.

Erscheint lt. Verlag	23.10.2016
Reihe/Serie	Springer Theses
Zusatzinfo	52 Illustrations, color; 8 Illustrations, black and white; XII, 89 p. 60 illus., 52 illus. in color.
Verlagsort	Tokyo
Sprache	englisch
Maße	155 x 235 mm
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
	Naturwissenschaften ► Physik / Astronomie ► Festkörperphysik
	Naturwissenschaften ► Physik / Astronomie ► Quantenphysik
	Technik ► Elektrotechnik / Energietechnik
	Technik ► Maschinenbau
Schlagworte	3D Skyrmion Crystal State • B20-type Transition-metal Germanium Compound • Gauge Flux of Berry Phase • Skyrmion Structure • Strong Spin-orbit Coupling • Thermoelectric Effect in Dirac Electron System • Topological Hall Effect in Skyrmions
ISBN-10	4-431-56306-7 / 4431563067
ISBN-13	978-4-431-56306-8 / 9784431563068
Zustand	Neuware