Theory of elastic constants for Ce-impurity systems: Effects of second-order deformations

Tomoya Kuromaru; Hiroaki Kusunose; Yoshio Kuramoto

doi:10.1143/JPSJ.70.521

Theory of elastic constants for Ce-impurity systems: Effects of second-order deformations

Tomoya Kuromaru, Hiroaki Kusunose, Yoshio Kuramoto

SCI - Physics

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

2 Citations (Scopus)

Abstract

Elastic constants of a single-impurity model with the Γ₈ ground state is studied with particular attention to the anisotropy induced by external magnetic field. We calculate elastic constants C₆₆ and C₄₄ taking account of deformations to second order. Under external magnetic field, field-induced quadrupole moments affect elastic constants through the coupling with second-order terms of deformations. It is shown, with an appropriate choice of coupling parameters, that the C₆₆ decreases with increasing magnetic field parallel to the (001)-axis. This single-ion model can also explain the splitting of the C₄₄-modes observed in ultrasonic measurement of Ceo.₅La_0.5B₆.

Original language	English
Pages (from-to)	521-531
Number of pages	11
Journal	journal of the physical society of japan
Volume	70
Issue number	2
DOIs	https://doi.org/10.1143/JPSJ.70.521
Publication status	Published - 2001 Feb 1

Keywords

CeLaB
Elastic constants
Field-induced quadrupole moment
Single-impurity model
The second-order deformations
The Γ-subspace

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1143/JPSJ.70.521

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title = "Theory of elastic constants for Ce-impurity systems: Effects of second-order deformations",

abstract = "Elastic constants of a single-impurity model with the Γ8 ground state is studied with particular attention to the anisotropy induced by external magnetic field. We calculate elastic constants C66 and C44 taking account of deformations to second order. Under external magnetic field, field-induced quadrupole moments affect elastic constants through the coupling with second-order terms of deformations. It is shown, with an appropriate choice of coupling parameters, that the C66 decreases with increasing magnetic field parallel to the (001)-axis. This single-ion model can also explain the splitting of the C44-modes observed in ultrasonic measurement of Ceo.5La0.5B6.",

keywords = "CeLaB, Elastic constants, Field-induced quadrupole moment, Single-impurity model, The second-order deformations, The Γ-subspace",

author = "Tomoya Kuromaru and Hiroaki Kusunose and Yoshio Kuramoto",

year = "2001",

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T1 - Theory of elastic constants for Ce-impurity systems

T2 - Effects of second-order deformations

AU - Kuromaru, Tomoya

AU - Kusunose, Hiroaki

AU - Kuramoto, Yoshio

PY - 2001/2/1

Y1 - 2001/2/1

N2 - Elastic constants of a single-impurity model with the Γ8 ground state is studied with particular attention to the anisotropy induced by external magnetic field. We calculate elastic constants C66 and C44 taking account of deformations to second order. Under external magnetic field, field-induced quadrupole moments affect elastic constants through the coupling with second-order terms of deformations. It is shown, with an appropriate choice of coupling parameters, that the C66 decreases with increasing magnetic field parallel to the (001)-axis. This single-ion model can also explain the splitting of the C44-modes observed in ultrasonic measurement of Ceo.5La0.5B6.

AB - Elastic constants of a single-impurity model with the Γ8 ground state is studied with particular attention to the anisotropy induced by external magnetic field. We calculate elastic constants C66 and C44 taking account of deformations to second order. Under external magnetic field, field-induced quadrupole moments affect elastic constants through the coupling with second-order terms of deformations. It is shown, with an appropriate choice of coupling parameters, that the C66 decreases with increasing magnetic field parallel to the (001)-axis. This single-ion model can also explain the splitting of the C44-modes observed in ultrasonic measurement of Ceo.5La0.5B6.

KW - CeLaB

KW - Elastic constants

KW - Field-induced quadrupole moment

KW - Single-impurity model

KW - The second-order deformations

KW - The Γ-subspace

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Theory of elastic constants for Ce-impurity systems: Effects of second-order deformations

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Keywords

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