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Γ3-type Lattice Instability and the Hidden Order of URu2Si2
Title: | Γ3-type Lattice Instability and the Hidden Order of URu2Si2 |
Authors: | Yanagisawa, Tatsuya Browse this author | Mombetsu, Shota Browse this author | Hidaka, Hiroyuki Browse this author | Amitsuka, Hiroshi Browse this author | Akatsu, Mitsuhiro Browse this author | Yasin, Shadi Browse this author | Zherlitsyn, Gergei Browse this author | Wosnitza, Jochen Browse this author | Huang, Kevin Browse this author | Maple, M. Brian Browse this author |
Keywords: | URu2Si2 | hidden order | elastic constant | ultrasound | pulsed-magnetic field |
Issue Date: | 2013 |
Publisher: | Physical Society of Japan |
Journal Title: | Journal of the Physical Society of Japan |
Volume: | 82 |
Start Page: | 013601 |
Publisher DOI: | 10.7566/JPSJ.82.013601 |
Abstract: | We have performed ultrasonic measurements on single-crystalline URu2Si2 with pulsed magnetic fields, in order to check for possible lattice instabilities due to the hybridized state and the hidden-order state of this compound. The elastic constant (C11-C12)/2, which is associated with a response to the Γ3-type symmetry-breaking (orthorhombic) strain field, shows a three-step increase at H 35 T for H k c at low temperatures, where successive meta-magnetic transitions are observed in the magnetization. We discovered a new fact that the absolute change of the softening of (C11-C12)/2 in the temperature dependence is quantitatively recovered at the suppression of hybridized-electronic state and the hidden order in high-magnetic field for H k c associated with the successive transitions. The present results suggest that the Γ3-type lattice instability, is related to both the emergence of the hybridized electronic state and the hidden-order parameter of URu2Si2. On the other hand, magnetic fields H k [100] and [110] enhance the softening of (C11-C12)/2 in the hidden order phase, while no step-like anomaly is observed up to 68.7 T.We discuss the limitation of the localized-electron picture for describing these features of URu2Si2 by examination of a crystalline electric field model in terms of mean-field theory. |
Rights: | © 2013 The Physical Society of Japan |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/51134 |
Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 柳澤 達也
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