Hidden Order and Exotic Superconductivity in the Heavy-Fermion Compound URu2Si2
Authors: Okazaki, Ryuji
Free Preview- 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
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- About this book
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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 “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.
- About the authors
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Dr.Ryuji Okazaki
Department of Physics, Nagoya University,
Chikusa, Nagoya 464-8602, Japan.
- Table of contents (6 chapters)
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Introduction
Pages 1-4
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Heavy-Fermion Superconductor $$\mathrm{URu}_{2}\mathrm{Si}_{2}$$
Pages 5-18
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Magnetic Torque Study on the Hidden-Order Phase
Pages 19-49
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Lower Critical Field Study on the Superconducting Phase
Pages 51-72
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Vortex Lattice Melting Transition
Pages 73-98
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Table of contents (6 chapters)
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Bibliographic Information
- Bibliographic Information
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- Book Title
- Hidden Order and Exotic Superconductivity in the Heavy-Fermion Compound URu2Si2
- Authors
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- Ryuji Okazaki
- Series Title
- Springer Theses
- Copyright
- 2013
- Publisher
- Springer Japan
- Copyright Holder
- Springer Japan
- eBook ISBN
- 978-4-431-54592-7
- DOI
- 10.1007/978-4-431-54592-7
- Hardcover ISBN
- 978-4-431-54591-0
- Softcover ISBN
- 978-4-431-56359-4
- Series ISSN
- 2190-5053
- Edition Number
- 1
- Number of Pages
- XIII, 102
- Number of Illustrations
- 71 illustrations in colour
- Topics
