Hidden Order and Exotic Superconductivity in the Heavy-Fermion Compound URu2Si2

  • Ryuji Okazaki

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xiii
  2. Ryuji Okazaki
    Pages 1-4
  3. Ryuji Okazaki
    Pages 73-98
  4. Ryuji Okazaki
    Pages 99-100
  5. Back Matter
    Pages 101-102

About this book


In this thesis, the author investigates hidden-order phase transition at T0 = 17.5 K in the heavy-fermion URu2Si2. The four-fold rotational symmetry breaking in the hidden order phase, which imposes a strong constraint on the theoretical model, is observed through the magnetic torque measurement. The translationally invariant phase with broken rotational symmetry is interpreted as meaning that the hidden-order phase is an electronic “nematic” phase. The observation of such nematicity in URu2Si2 indicates a ubiquitous nature among the strongly correlated electron systems.

The author also studies the superconducting state of URu2Si2 below Tc = 1.4 K, which coexists with the hidden-order phase. A peculiar vortex penetration in the superconducting state is found, which may be related to the rotational symmetry breaking in the hidden-order phase. The author also identifies a vortex lattice melting transition. This transport study provides essential clues to the underlying issue of quasiparticle dynamics as to whether a quasiparticle Bloch state is realized in the periodic vortex lattice.


Electronic Nematicity Heavy-fermion Superconductors Heavy-fermion URu2Si2 Hidden Order in Correlated Electron Systems Quasiparticle Bloch State Superconducting State of URu2Si2 URu2Si2 Vortex Lattice Melting

Authors and affiliations

  • Ryuji Okazaki
    • 1
  1. 1.Department of PhysicsNagoya UniversityNagoyaJapan

Bibliographic information