The study of electronic structure in new Hg-based Sr-containing 1212-typed (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 superconductors

R. S. Liu; J. M. Chen; S. F. Hu

doi:10.1016/S0921-4534(97)00597-2

The study of electronic structure in new Hg-based Sr-containing 1212-typed (Hg_0.5Pb_0.5)Sr₂(Ca_1-xY _x)Cu₂O₇ superconductors

R. S. Liu^*, J. M. Chen, S. F. Hu

^*Corresponding author for this work

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

Abstract

High resolution O K-edge X-ray-absorption near-edge-structure (XANES) spectra for the series of new Hg-based Sr-containing 1212-typed (Hg_0.5Pb_0.5)Sr₂(Ca_1-xY _x)Cu₂O₇ superconductors (x = 0.3 ∼ 0.7) were measured using a bulk-sensitive total-X-ray-fluorescence-yield technique. Near the O 1s edge, the pre-edge peak with maxima at ∼ 528.3 eV is ascribed to transitions into O 2p holes located in the CuO₂ planes. The intensity of this pre-edge peak monotonically increases with increasing doping level of Ca²⁺ into the Y³⁺ sites. The effect of chemical substitution of Ca²⁺ for Y³⁺ in (Hg_0.5Pb_0.5)Sr₂(Ca_1-xY _x)Cu₂O₇ is to induce O 2p hole states in the CuO₂ planes near the Fermi level which cause an increase of T_c from 15 K for x = 0.6 to 90 K for x = 0.3. Moreover, the generation of O 2p holes within the CuO₂ planes is probably responsible for inducing a transition from a semiconductor to a superconductor.

Original language	English
Pages (from-to)	961-962
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	282-287
Issue number	PART 2
DOIs	https://doi.org/10.1016/S0921-4534(97)00597-2
Publication status	Published - 1997 Aug
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/S0921-4534(97)00597-2

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title = "The study of electronic structure in new Hg-based Sr-containing 1212-typed (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 superconductors",

abstract = "High resolution O K-edge X-ray-absorption near-edge-structure (XANES) spectra for the series of new Hg-based Sr-containing 1212-typed (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 superconductors (x = 0.3 ∼ 0.7) were measured using a bulk-sensitive total-X-ray-fluorescence-yield technique. Near the O 1s edge, the pre-edge peak with maxima at ∼ 528.3 eV is ascribed to transitions into O 2p holes located in the CuO2 planes. The intensity of this pre-edge peak monotonically increases with increasing doping level of Ca2+ into the Y3+ sites. The effect of chemical substitution of Ca2+ for Y3+ in (Hg0.5Pb0.5)Sr2(Ca1-xY x)Cu2O7 is to induce O 2p hole states in the CuO2 planes near the Fermi level which cause an increase of Tc from 15 K for x = 0.6 to 90 K for x = 0.3. Moreover, the generation of O 2p holes within the CuO2 planes is probably responsible for inducing a transition from a semiconductor to a superconductor.",

author = "Liu, {R. S.} and Chen, {J. M.} and Hu, {S. F.}",

note = "Funding Information: This research is financially supported by SRRC and National Science Council of the Republic of China under the Grant NSC-86-2113-M-002-020.",

year = "1997",

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doi = "10.1016/S0921-4534(97)00597-2",

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AU - Hu, S. F.

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The study of electronic structure in new Hg-based Sr-containing 1212-typed (Hg_0.5Pb_0.5)Sr₂(Ca_1-xY _x)Cu₂O₇ superconductors

Abstract

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