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

  • Naoya¬†Kanazawa

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xii
  2. Naoya Kanazawa
    Pages 1-21
  3. Naoya Kanazawa
    Pages 23-27
  4. Naoya Kanazawa
    Pages 85-86
  5. Back Matter
    Pages 87-89

About this book

Introduction

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.

Keywords

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

Authors and affiliations

  • Naoya¬†Kanazawa
    • 1
  1. 1.Department of Applied PhysicsThe University of TokyoTokyoJapan

Bibliographic information

  • DOI https://doi.org/10.1007/978-4-431-55660-2
  • Copyright Information Springer Japan 2015
  • Publisher Name Springer, Tokyo
  • eBook Packages Physics and Astronomy
  • Print ISBN 978-4-431-55659-6
  • Online ISBN 978-4-431-55660-2
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
  • Buy this book on publisher's site