Metal-insulator transition and Cu K-edge XANES studies for Pr1.85Ce0.15CuO4+δ high-Tc superconductors

Y. Y. Hsu; B. N. Lin; J. F. Lee; L. Y. Jang; H. C. Ku

doi:10.1023/A:1022906025999

Metal-insulator transition and Cu K-edge XANES studies for Pr_1.85Ce_0.15CuO_4+δ high-T_c superconductors

Y. Y. Hsu^*, B. N. Lin, J. F. Lee, L. Y. Jang, H. C. Ku

^*Corresponding author for this work

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

4 Citations (Scopus)

Abstract

Metal-insulator transition near oxygen content parameter δ ≃ 0.018 was observed for electron-doped Pr_1.85 Ce_0.15 CuO_4+δ (-0.003 ≤ δ ≤ 0.03 cuprates. Cu K -edge X-ray absorption near-edge structure (XANES) studies with nearly identical threshold edge energy E_o of 8980.8 eV indicate a Cu formal valence smaller than 2 for all samples, which is consistent with the estimated Cu valence of ∼ 1.84 for 20.5 K superconductor Pr_1.85 Ce_0.15 CuO_3.997 and ∼ 1.91 for Pr_1.85 Ce_0.15 CuO_4.03 insulator. The XANES spectrum reflects the Cu 3dⁿ character where low energy peak A₁ reflects the 3d¹⁰ configuration of Cu(I) oxidation state and A₂ peak reflects the 3d¹⁰ L (L for a oxygen ligand hole) configuration for Cu(II) oxidation state. The variation of energy separation Δ E (A₂-A₁) is consistent with the observed metal-insulator transition, increases sharply from 2.42 e V for Pr_1.85 Ce_0.15 CuO_4.018 insulator to 2.74 e V for 15 K underdoped superconductor Pr_1.85 Ce_0.15 CuO_4.015.

Original language	English
Pages (from-to)	343-347
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	131
Issue number	3-4
DOIs	https://doi.org/10.1023/A:1022906025999
Publication status	Published - 2003 May
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1023/A:1022906025999

Cite this

@article{29e3a4b61dbe46f98dd95558d970210b,

title = "Metal-insulator transition and Cu K-edge XANES studies for Pr1.85Ce0.15CuO4+δ high-Tc superconductors",

abstract = "Metal-insulator transition near oxygen content parameter δ ≃ 0.018 was observed for electron-doped Pr1.85 Ce0.15 CuO4+δ (-0.003 ≤ δ ≤ 0.03 cuprates. Cu K -edge X-ray absorption near-edge structure (XANES) studies with nearly identical threshold edge energy Eo of 8980.8 eV indicate a Cu formal valence smaller than 2 for all samples, which is consistent with the estimated Cu valence of ∼ 1.84 for 20.5 K superconductor Pr1.85 Ce0.15 CuO3.997 and ∼ 1.91 for Pr1.85 Ce0.15 CuO4.03 insulator. The XANES spectrum reflects the Cu 3dn character where low energy peak A1 reflects the 3d10 configuration of Cu(I) oxidation state and A2 peak reflects the 3d10 L (L for a oxygen ligand hole) configuration for Cu(II) oxidation state. The variation of energy separation Δ E (A2-A1) is consistent with the observed metal-insulator transition, increases sharply from 2.42 e V for Pr1.85 Ce0.15 CuO4.018 insulator to 2.74 e V for 15 K underdoped superconductor Pr1.85 Ce0.15 CuO4.015.",

author = "Hsu, {Y. Y.} and Lin, {B. N.} and Lee, {J. F.} and Jang, {L. Y.} and Ku, {H. C.}",

year = "2003",

month = may,

doi = "10.1023/A:1022906025999",

language = "English",

volume = "131",

pages = "343--347",

journal = "Journal of Low Temperature Physics",

issn = "0022-2291",

publisher = "Springer New York",

number = "3-4",

}

TY - JOUR

T1 - Metal-insulator transition and Cu K-edge XANES studies for Pr1.85Ce0.15CuO4+δ high-Tc superconductors

AU - Hsu, Y. Y.

AU - Lin, B. N.

AU - Lee, J. F.

AU - Jang, L. Y.

AU - Ku, H. C.

PY - 2003/5

Y1 - 2003/5

N2 - Metal-insulator transition near oxygen content parameter δ ≃ 0.018 was observed for electron-doped Pr1.85 Ce0.15 CuO4+δ (-0.003 ≤ δ ≤ 0.03 cuprates. Cu K -edge X-ray absorption near-edge structure (XANES) studies with nearly identical threshold edge energy Eo of 8980.8 eV indicate a Cu formal valence smaller than 2 for all samples, which is consistent with the estimated Cu valence of ∼ 1.84 for 20.5 K superconductor Pr1.85 Ce0.15 CuO3.997 and ∼ 1.91 for Pr1.85 Ce0.15 CuO4.03 insulator. The XANES spectrum reflects the Cu 3dn character where low energy peak A1 reflects the 3d10 configuration of Cu(I) oxidation state and A2 peak reflects the 3d10 L (L for a oxygen ligand hole) configuration for Cu(II) oxidation state. The variation of energy separation Δ E (A2-A1) is consistent with the observed metal-insulator transition, increases sharply from 2.42 e V for Pr1.85 Ce0.15 CuO4.018 insulator to 2.74 e V for 15 K underdoped superconductor Pr1.85 Ce0.15 CuO4.015.

AB - Metal-insulator transition near oxygen content parameter δ ≃ 0.018 was observed for electron-doped Pr1.85 Ce0.15 CuO4+δ (-0.003 ≤ δ ≤ 0.03 cuprates. Cu K -edge X-ray absorption near-edge structure (XANES) studies with nearly identical threshold edge energy Eo of 8980.8 eV indicate a Cu formal valence smaller than 2 for all samples, which is consistent with the estimated Cu valence of ∼ 1.84 for 20.5 K superconductor Pr1.85 Ce0.15 CuO3.997 and ∼ 1.91 for Pr1.85 Ce0.15 CuO4.03 insulator. The XANES spectrum reflects the Cu 3dn character where low energy peak A1 reflects the 3d10 configuration of Cu(I) oxidation state and A2 peak reflects the 3d10 L (L for a oxygen ligand hole) configuration for Cu(II) oxidation state. The variation of energy separation Δ E (A2-A1) is consistent with the observed metal-insulator transition, increases sharply from 2.42 e V for Pr1.85 Ce0.15 CuO4.018 insulator to 2.74 e V for 15 K underdoped superconductor Pr1.85 Ce0.15 CuO4.015.

UR - http://www.scopus.com/inward/record.url?scp=0037901404&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037901404&partnerID=8YFLogxK

U2 - 10.1023/A:1022906025999

DO - 10.1023/A:1022906025999

M3 - Article

AN - SCOPUS:0037901404

SN - 0022-2291

VL - 131

SP - 343

EP - 347

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 3-4

ER -

Metal-insulator transition and Cu K-edge XANES studies for Pr_1.85Ce_0.15CuO_4+δ high-T_c superconductors

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this