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Γ3-type Lattice Instability and the Hidden Order of URu2Si2

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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
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)
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)

Submitter: 柳澤 達也

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