Trigonal lattice distortion and ferro-quadrupole ordering in phase IV of CexLa1-xB6 (x = 0.75 and 0.70)

Mitsuhiro Akatsu; Terutaka Goto; Yuichi Nemoto; Osamu Suzuki; Shintaro Nakamura; Satoru Kunii

doi:10.1143/JPSJ.72.205

Trigonal lattice distortion and ferro-quadrupole ordering in phase IV of Ce_xLa_1-xB₆ (x = 0.75 and 0.70)

Mitsuhiro Akatsu, Terutaka Goto, Yuichi Nemoto, Osamu Suzuki, Shintaro Nakamura, Satoru Kunii

Institute for Materials Research (IMR) (institute affiliation only)

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

45 Citations (Scopus)

Abstract

The low-temperature lattice effects of the Kondo compounds Ce _xLa_1-xB₆ (x = 0.75 and 0.70) with a Γ₈ ground state have been investigated by dilatometric measurements. In an ordered phase IV below T_C = 1.6K (1.4K) for x = 0.75 (0.70), the lattice length along the [001] direction reveals an increase, while the length along the [111] direction shows an appreciable decrease. This lattice distortion is described in terms of the trigonal strain (ε_yz) = (ε_zx) = (ε_xy) ≠ 0 with Γ₅ symmetry in addition to a volume expansion ε_B = ε_xx + ε_yy + ε_zz with full symmetry Γ₁. The trigonal strain in phase IV indicates a ferro-quadrupole ordering of (O_yz) = (O _zx) = (O_xy) ≠ 0.

Original language	English
Pages (from-to)	205-208
Number of pages	4
Journal	journal of the physical society of japan
Volume	72
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.72.205
Publication status	Published - 2003 Feb 1

Keywords

CeLaB
Quadrupole ordering
Thermal expansion

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.72.205

Cite this

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title = "Trigonal lattice distortion and ferro-quadrupole ordering in phase IV of CexLa1-xB6 (x = 0.75 and 0.70)",

abstract = "The low-temperature lattice effects of the Kondo compounds Ce xLa1-xB6 (x = 0.75 and 0.70) with a Γ8 ground state have been investigated by dilatometric measurements. In an ordered phase IV below TC = 1.6K (1.4K) for x = 0.75 (0.70), the lattice length along the [001] direction reveals an increase, while the length along the [111] direction shows an appreciable decrease. This lattice distortion is described in terms of the trigonal strain (εyz) = (εzx) = (εxy) ≠ 0 with Γ5 symmetry in addition to a volume expansion εB = εxx + εyy + εzz with full symmetry Γ1. The trigonal strain in phase IV indicates a ferro-quadrupole ordering of (Oyz) = (O zx) = (Oxy) ≠ 0.",

keywords = "CeLaB, Quadrupole ordering, Thermal expansion",

author = "Mitsuhiro Akatsu and Terutaka Goto and Yuichi Nemoto and Osamu Suzuki and Shintaro Nakamura and Satoru Kunii",

year = "2003",

month = feb,

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doi = "10.1143/JPSJ.72.205",

language = "English",

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journal = "Journal of the Physical Society of Japan",

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T1 - Trigonal lattice distortion and ferro-quadrupole ordering in phase IV of CexLa1-xB6 (x = 0.75 and 0.70)

AU - Akatsu, Mitsuhiro

AU - Goto, Terutaka

AU - Nemoto, Yuichi

AU - Suzuki, Osamu

AU - Nakamura, Shintaro

AU - Kunii, Satoru

PY - 2003/2/1

Y1 - 2003/2/1

N2 - The low-temperature lattice effects of the Kondo compounds Ce xLa1-xB6 (x = 0.75 and 0.70) with a Γ8 ground state have been investigated by dilatometric measurements. In an ordered phase IV below TC = 1.6K (1.4K) for x = 0.75 (0.70), the lattice length along the [001] direction reveals an increase, while the length along the [111] direction shows an appreciable decrease. This lattice distortion is described in terms of the trigonal strain (εyz) = (εzx) = (εxy) ≠ 0 with Γ5 symmetry in addition to a volume expansion εB = εxx + εyy + εzz with full symmetry Γ1. The trigonal strain in phase IV indicates a ferro-quadrupole ordering of (Oyz) = (O zx) = (Oxy) ≠ 0.

AB - The low-temperature lattice effects of the Kondo compounds Ce xLa1-xB6 (x = 0.75 and 0.70) with a Γ8 ground state have been investigated by dilatometric measurements. In an ordered phase IV below TC = 1.6K (1.4K) for x = 0.75 (0.70), the lattice length along the [001] direction reveals an increase, while the length along the [111] direction shows an appreciable decrease. This lattice distortion is described in terms of the trigonal strain (εyz) = (εzx) = (εxy) ≠ 0 with Γ5 symmetry in addition to a volume expansion εB = εxx + εyy + εzz with full symmetry Γ1. The trigonal strain in phase IV indicates a ferro-quadrupole ordering of (Oyz) = (O zx) = (Oxy) ≠ 0.

KW - CeLaB

KW - Quadrupole ordering

KW - Thermal expansion

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