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Describes precise magnetic torque measurement using micro cantilever and local magnetization measurement using micro-Hall array
Investigates the symmetry breaking in the hidden-order phase of URu2Si2 and vortex state in the superconducting phase
Covers observation of the vortex lattice melting transition in ultraclean URu2Si2 single crystals at sub-Kelvin temperatures
Nominated as an outstanding contribution by Kyoto University's Physics Department in 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.
Content Level »Research
Keywords »Electronic Nematicity - Heavy-fermion Superconductors - Heavy-fermion URu2Si2 - Hidden Order in Correlated Electron Systems - Quasiparticle Bloch State - Superconducting State of URu2Si2 - URu2Si2 - Vortex Lattice Melting
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.