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

di Ryuji Okazaki (Autore)

Springer Verlag, Japan, 2013

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.

• Autore: Ryuji Okazaki
• Editore: Springer Verlag, Japan
• Collana: Springer Theses
• Anno: 2013
• Rilegatura: Hardback
• Pagine: 102 p.
• Dimensioni: 235 x 155 mm
• EAN: 9784431545910

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