Lattice Instability and Elastic Response in the Heavy Electron System URu2Si2

Keitaro Kuwahara; Hiroshi Amitsuka; Toshiro Sakakibara; Osamu Suzuki; Shintaro Nakamura; Terutaka Goto; Marián Mihalik; Alois A. Menovsky; Anne De Visser; Jaap J.M. Franse

doi:10.1143/JPSJ.66.3251

Lattice Instability and Elastic Response in the Heavy Electron System URu₂Si₂

Keitaro Kuwahara, Hiroshi Amitsuka, Toshiro Sakakibara, Osamu Suzuki, Shintaro Nakamura, Terutaka Goto, Marián Mihalik, Alois A. Menovsky, Anne De Visser, Jaap J.M. Franse

IMR - Institute for Materials Research (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

We have performed thermal expansion and elastic constant measurements of the heavy electron system URu₂Si₂, focusing attention on the Γ₃(x² - y²) and Γ₄ (xy) symmetry of the tetragonal group D_4h. It is reconfirmed that there is no sizable uniform spontaneous distortion for these two types of symmetry through the puzzling phase transition at T₀ = 17.5 K. On the other hand a weak but significant tendency of softening are found below about 70 K in the transverse (c₁₁ - c₁₂) /2 mode. The results strongly suggest the presence of a lattice instability in the Γ₃ symmetry From the results, proposed crystalline-electric-field models are also discussed.

Original language	English
Pages (from-to)	3251-3258
Number of pages	8
Journal	Journal of the Physical Society of Japan
Volume	66
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.66.3251
Publication status	Published - 1997 Oct

Keywords

Elastic constant
Heavy electron
Lattice instability
Thermal expansion
URuSi

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title = "Lattice Instability and Elastic Response in the Heavy Electron System URu2Si2",

abstract = "We have performed thermal expansion and elastic constant measurements of the heavy electron system URu2Si2, focusing attention on the Γ3(x2 - y2) and Γ4 (xy) symmetry of the tetragonal group D4h. It is reconfirmed that there is no sizable uniform spontaneous distortion for these two types of symmetry through the puzzling phase transition at T0 = 17.5 K. On the other hand a weak but significant tendency of softening are found below about 70 K in the transverse (c11 - c12) /2 mode. The results strongly suggest the presence of a lattice instability in the Γ3 symmetry From the results, proposed crystalline-electric-field models are also discussed.",

keywords = "Elastic constant, Heavy electron, Lattice instability, Thermal expansion, URuSi",

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T1 - Lattice Instability and Elastic Response in the Heavy Electron System URu2Si2

AU - Kuwahara, Keitaro

AU - Amitsuka, Hiroshi

AU - Sakakibara, Toshiro

AU - Suzuki, Osamu

AU - Nakamura, Shintaro

AU - Goto, Terutaka

AU - Mihalik, Marián

AU - Menovsky, Alois A.

AU - De Visser, Anne

AU - Franse, Jaap J.M.

PY - 1997/10

Y1 - 1997/10

N2 - We have performed thermal expansion and elastic constant measurements of the heavy electron system URu2Si2, focusing attention on the Γ3(x2 - y2) and Γ4 (xy) symmetry of the tetragonal group D4h. It is reconfirmed that there is no sizable uniform spontaneous distortion for these two types of symmetry through the puzzling phase transition at T0 = 17.5 K. On the other hand a weak but significant tendency of softening are found below about 70 K in the transverse (c11 - c12) /2 mode. The results strongly suggest the presence of a lattice instability in the Γ3 symmetry From the results, proposed crystalline-electric-field models are also discussed.

AB - We have performed thermal expansion and elastic constant measurements of the heavy electron system URu2Si2, focusing attention on the Γ3(x2 - y2) and Γ4 (xy) symmetry of the tetragonal group D4h. It is reconfirmed that there is no sizable uniform spontaneous distortion for these two types of symmetry through the puzzling phase transition at T0 = 17.5 K. On the other hand a weak but significant tendency of softening are found below about 70 K in the transverse (c11 - c12) /2 mode. The results strongly suggest the presence of a lattice instability in the Γ3 symmetry From the results, proposed crystalline-electric-field models are also discussed.

KW - Elastic constant

KW - Heavy electron

KW - Lattice instability

KW - Thermal expansion

KW - URuSi

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Lattice Instability and Elastic Response in the Heavy Electron System URu₂Si₂

Abstract

Keywords

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