Effect of crystal symmetry on O′-phase weak ferromagnetism

H. C. Ku; H. M. Luo; B. N. Lin; Y. P. Chi; Y. Y. Hsu; Y. P. Sun; T. J. Lee

doi:10.1016/S0921-4526(99)02514-4

Effect of crystal symmetry on O′-phase weak ferromagnetism

H. C. Ku^*, H. M. Luo, B. N. Lin, Y. P. Chi, Y. Y. Hsu, Y. P. Sun, T. J. Lee

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

Correlation between copper weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order and structural symmetry of the Gd_2-xR_xCuO₄ (R = Eu and Tb) systems is reported. With smaller rare earth ions, lattice mismatch between (Gd, R)₂ O₂ and CuO₂ layers results in a small oxygen distortion in square CuO₂ plane. The distortion lowers the crystal symmetry from tetragonal T′- to an orthorhombic O′-phase. The weak ferromagnetism is a direct result of such a non-180° α(Cu-O-Cu) coupling with CAF alignment and a WF saturation moment m_s(Cu²⁺) = μ(Cu²⁺) sin θ, with canting angle θ = (π - α)/2. Magnetic and crystallographic data indicate that the magnetic moment m(T) and the canting angle θ decrease (increase) with larger (smaller) ion doping.

Original language	English
Pages (from-to)	1373-1374
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	284-288
Issue number	PART II
DOIs	https://doi.org/10.1016/S0921-4526(99)02514-4
Publication status	Published - 2000
Externally published	Yes

Keywords

GdRCuO
O'-phase
Weak ferromagnetism

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(99)02514-4

Cite this

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title = "Effect of crystal symmetry on O′-phase weak ferromagnetism",

abstract = "Correlation between copper weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order and structural symmetry of the Gd2-xRxCuO4 (R = Eu and Tb) systems is reported. With smaller rare earth ions, lattice mismatch between (Gd, R)2 O2 and CuO2 layers results in a small oxygen distortion in square CuO2 plane. The distortion lowers the crystal symmetry from tetragonal T′- to an orthorhombic O′-phase. The weak ferromagnetism is a direct result of such a non-180° α(Cu-O-Cu) coupling with CAF alignment and a WF saturation moment ms(Cu2+) = μ(Cu2+) sin θ, with canting angle θ = (π - α)/2. Magnetic and crystallographic data indicate that the magnetic moment m(T) and the canting angle θ decrease (increase) with larger (smaller) ion doping.",

keywords = "GdRCuO, O'-phase, Weak ferromagnetism",

author = "Ku, {H. C.} and Luo, {H. M.} and Lin, {B. N.} and Chi, {Y. P.} and Hsu, {Y. Y.} and Sun, {Y. P.} and Lee, {T. J.}",

year = "2000",

doi = "10.1016/S0921-4526(99)02514-4",

language = "English",

volume = "284-288",

pages = "1373--1374",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier",

number = "PART II",

}

TY - JOUR

T1 - Effect of crystal symmetry on O′-phase weak ferromagnetism

AU - Ku, H. C.

AU - Luo, H. M.

AU - Lin, B. N.

AU - Chi, Y. P.

AU - Hsu, Y. Y.

AU - Sun, Y. P.

AU - Lee, T. J.

PY - 2000

Y1 - 2000

N2 - Correlation between copper weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order and structural symmetry of the Gd2-xRxCuO4 (R = Eu and Tb) systems is reported. With smaller rare earth ions, lattice mismatch between (Gd, R)2 O2 and CuO2 layers results in a small oxygen distortion in square CuO2 plane. The distortion lowers the crystal symmetry from tetragonal T′- to an orthorhombic O′-phase. The weak ferromagnetism is a direct result of such a non-180° α(Cu-O-Cu) coupling with CAF alignment and a WF saturation moment ms(Cu2+) = μ(Cu2+) sin θ, with canting angle θ = (π - α)/2. Magnetic and crystallographic data indicate that the magnetic moment m(T) and the canting angle θ decrease (increase) with larger (smaller) ion doping.

AB - Correlation between copper weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order and structural symmetry of the Gd2-xRxCuO4 (R = Eu and Tb) systems is reported. With smaller rare earth ions, lattice mismatch between (Gd, R)2 O2 and CuO2 layers results in a small oxygen distortion in square CuO2 plane. The distortion lowers the crystal symmetry from tetragonal T′- to an orthorhombic O′-phase. The weak ferromagnetism is a direct result of such a non-180° α(Cu-O-Cu) coupling with CAF alignment and a WF saturation moment ms(Cu2+) = μ(Cu2+) sin θ, with canting angle θ = (π - α)/2. Magnetic and crystallographic data indicate that the magnetic moment m(T) and the canting angle θ decrease (increase) with larger (smaller) ion doping.

KW - GdRCuO

KW - O'-phase

KW - Weak ferromagnetism

UR - http://www.scopus.com/inward/record.url?scp=0033716549&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033716549&partnerID=8YFLogxK

U2 - 10.1016/S0921-4526(99)02514-4

DO - 10.1016/S0921-4526(99)02514-4

M3 - Article

AN - SCOPUS:0033716549

SN - 0921-4526

VL - 284-288

SP - 1373

EP - 1374

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - PART II

ER -

Effect of crystal symmetry on O′-phase weak ferromagnetism

Abstract

Keywords

ASJC Scopus subject areas

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