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

2013
ISBN: 978-4-431-54591-0
Verlag: Springer

Buch, Englisch, 102 Seiten, Format (B × H): 160 mm x 241 mm, Gewicht: 348 g

Reihe: Springer Theses

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.

Zielgruppe

Research

Autoren/Hrsg.

Okazaki, Ryuji

Fachgebiete

• Technische Wissenschaften Elektronik | Nachrichtentechnik Elektronik Halb- und Supraleitertechnologie
• Naturwissenschaften Physik Elektromagnetismus Halbleiter- und Supraleiterphysik
• Naturwissenschaften Physik Thermodynamik Festkörperphysik, Kondensierte Materie
• Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde Materialwissenschaft: Elektronik, Optik

Inhaltsverzeichnis

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

Über Autor(innen)

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