Variation of crystal symmetry, superconductivity and weak ferromagnetism in (R1-yGdy)1.85Ce0.15CuO 4-δ (R = Nd, Eu) cuprates

B. N. Lin; H. C. Chiang; Y. H. Lin; H. B. Yang; Y. Y. Hsu; H. M. Luo; H. C. Ku

doi:10.1016/S0921-4526(99)00788-7

Variation of crystal symmetry, superconductivity and weak ferromagnetism in (R_1-yGd_y)_1.85Ce_0.15CuO _4-δ (R = Nd, Eu) cuprates

B. N. Lin^*, H. C. Chiang, Y. H. Lin, H. B. Yang, Y. Y. Hsu, H. M. Luo, H. C. Ku

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

Abstract

Metal-insulator transition in the Gd-doped (R_1-yGd_y)_1.85Ce_0.15CuO _4-δ systems occurred around y ∼ 0.1 for R = Eu and y ∼ 0.65 for R = Nd with a simultaneous structural transition from the tetragonal T′-phase (space group I4/mmm) to an orthorhombic O′-phase (Acam, a₀ ≤ b₀ ∼ √2a_t). The structural distortion is due to the lattice mismatch between smaller (R,Gd,Ce)₂O₂ layer and CuO₂ plane which results in an oxygen distortion in the otherwise perfect CuO₂ square plane. The phase diagram indicates that the superconductivity can only occur in the metallic T′-phase cuprates where the metallic state is controlled by a delicate balance between oxygen reduction and structural stability. The Cu²⁺ weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order observed in the insulating region is the direct result of non-180° α(Cu-O-Cu) canting angle of the O′-phase.

Original language	English
Pages (from-to)	922-923
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	281-282
DOIs	https://doi.org/10.1016/S0921-4526(99)00788-7
Publication status	Published - 2000
Externally published	Yes
Event	Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) - Nagano, Japan Duration: 1999 Aug 24 → 1999 Aug 28

Keywords

Distorted T′-phase (O′-phase)
Superconductivity
Weak ferromagnetism

ASJC Scopus subject areas

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

Access to Document

10.1016/S0921-4526(99)00788-7

Cite this

@article{6efef5c852ab4d7db7bc670914a95ec9,

title = "Variation of crystal symmetry, superconductivity and weak ferromagnetism in (R1-yGdy)1.85Ce0.15CuO 4-δ (R = Nd, Eu) cuprates",

abstract = "Metal-insulator transition in the Gd-doped (R1-yGdy)1.85Ce0.15CuO 4-δ systems occurred around y ∼ 0.1 for R = Eu and y ∼ 0.65 for R = Nd with a simultaneous structural transition from the tetragonal T′-phase (space group I4/mmm) to an orthorhombic O′-phase (Acam, a0 ≤ b0 ∼ √2at). The structural distortion is due to the lattice mismatch between smaller (R,Gd,Ce)2O2 layer and CuO2 plane which results in an oxygen distortion in the otherwise perfect CuO2 square plane. The phase diagram indicates that the superconductivity can only occur in the metallic T′-phase cuprates where the metallic state is controlled by a delicate balance between oxygen reduction and structural stability. The Cu2+ weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order observed in the insulating region is the direct result of non-180° α(Cu-O-Cu) canting angle of the O′-phase.",

keywords = "Distorted T′-phase (O′-phase), Superconductivity, Weak ferromagnetism",

author = "Lin, {B. N.} and Chiang, {H. C.} and Lin, {Y. H.} and Yang, {H. B.} and Hsu, {Y. Y.} and Luo, {H. M.} and Ku, {H. C.}",

note = "Funding Information: This research is supported by NSC-87-2112-M007-007 and −025. ; Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99) ; Conference date: 24-08-1999 Through 28-08-1999",

year = "2000",

doi = "10.1016/S0921-4526(99)00788-7",

language = "English",

volume = "281-282",

pages = "922--923",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Variation of crystal symmetry, superconductivity and weak ferromagnetism in (R1-yGdy)1.85Ce0.15CuO 4-δ (R = Nd, Eu) cuprates

AU - Lin, B. N.

AU - Chiang, H. C.

AU - Lin, Y. H.

AU - Yang, H. B.

AU - Hsu, Y. Y.

AU - Luo, H. M.

AU - Ku, H. C.

N1 - Funding Information: This research is supported by NSC-87-2112-M007-007 and −025.

PY - 2000

Y1 - 2000

N2 - Metal-insulator transition in the Gd-doped (R1-yGdy)1.85Ce0.15CuO 4-δ systems occurred around y ∼ 0.1 for R = Eu and y ∼ 0.65 for R = Nd with a simultaneous structural transition from the tetragonal T′-phase (space group I4/mmm) to an orthorhombic O′-phase (Acam, a0 ≤ b0 ∼ √2at). The structural distortion is due to the lattice mismatch between smaller (R,Gd,Ce)2O2 layer and CuO2 plane which results in an oxygen distortion in the otherwise perfect CuO2 square plane. The phase diagram indicates that the superconductivity can only occur in the metallic T′-phase cuprates where the metallic state is controlled by a delicate balance between oxygen reduction and structural stability. The Cu2+ weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order observed in the insulating region is the direct result of non-180° α(Cu-O-Cu) canting angle of the O′-phase.

AB - Metal-insulator transition in the Gd-doped (R1-yGdy)1.85Ce0.15CuO 4-δ systems occurred around y ∼ 0.1 for R = Eu and y ∼ 0.65 for R = Nd with a simultaneous structural transition from the tetragonal T′-phase (space group I4/mmm) to an orthorhombic O′-phase (Acam, a0 ≤ b0 ∼ √2at). The structural distortion is due to the lattice mismatch between smaller (R,Gd,Ce)2O2 layer and CuO2 plane which results in an oxygen distortion in the otherwise perfect CuO2 square plane. The phase diagram indicates that the superconductivity can only occur in the metallic T′-phase cuprates where the metallic state is controlled by a delicate balance between oxygen reduction and structural stability. The Cu2+ weak-ferromagnetic/canted-antiferromagnetic (WF/CAF) order observed in the insulating region is the direct result of non-180° α(Cu-O-Cu) canting angle of the O′-phase.

KW - Distorted T′-phase (O′-phase)

KW - Superconductivity

KW - Weak ferromagnetism

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U2 - 10.1016/S0921-4526(99)00788-7

DO - 10.1016/S0921-4526(99)00788-7

M3 - Conference article

AN - SCOPUS:0033905010

SN - 0921-4526

VL - 281-282

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EP - 923

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

T2 - Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99)

Y2 - 24 August 1999 through 28 August 1999

ER -