Ryuji Okazaki

Hidden Order and Exotic Superconductivity in the Heavy-Fermion Compound URu2Si2 (eBook, PDF)

• Format: PDF

Produktbeschreibung

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.

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Produktdetails

• Verlag: Springer Japan
• Seitenzahl: 102
• Erscheinungstermin: 29. November 2013
• Englisch
• ISBN-13: 9784431545927
• Artikelnr.: 43789762

Autorenporträt

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

Inhaltsangabe

Introduction.- Heavy-Fermion Superconductor URu 2 Si 2 .- Magnetic torque Study on the Hidden-Order Phase.- Lower Critical Field Study on the Superconducting Phase.- Vortex Lattice Melting Transition.- Conclusion.