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

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

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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 a€œnematica€ 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.The solid line shows a fitting by an expression I = I0 + AT2 A short cantilever for torque detection and a reference ... We used a current source (KEITHLEY 6221A) and a voltmeter (KEITHLEY 2182A) to measure the resistivity change in theanbsp;...


Title:Hidden Order and Exotic Superconductivity in the Heavy-Fermion Compound URu2Si2
Author: Ryuji Okazaki
Publisher:Springer Science & Business Media - 2013-11-29
ISBN-13:

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