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

by Ryuji Okazaki

Overview

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 T_c = 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.

Product Details

ISBN-13:	9784431545910
Publisher:	Springer Japan
Publication date:	11/28/2013
Series:	Springer Theses
Edition description:	2013
Pages:	102
Product dimensions:	6.10(w) x 9.25(h) x 0.01(d)

About the Author

Dr.Ryuji Okazaki
Department of Physics, Nagoya University,
Chikusa, Nagoya 464-8602, Japan.

Table of Contents

Introduction.- Heavy-Fermion Superconductor URu₂Si₂.- Magnetic torque Study on the Hidden-Order Phase.- Lower Critical Field Study on the Superconducting Phase.- Vortex Lattice Melting Transition.- Conclusion.