Raman study of the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ

H. Chang; Z. H. He; R. L. Meng; Y. Y. Xue; C. W. Chu

doi:10.1016/0921-4534(95)00383-5

Raman study of the thermal stability of HgBa₂CaCu₂O_6+δ and HgBa₂Ca₂Cu₃O_8+δ

H. Chang, Z. H. He, R. L. Meng, Y. Y. Xue, C. W. Chu

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Abstract

We studied the thermal stability of HgBa₂CaCu₂O_6+δ and HgBa₂Ca₂Cu₃O_8+δ at varying laser irradiation power. Each compound has two Raman bands around 570 and 590 cm^-1 which are assigned to the vibrations of the interstitial oxygen in HgO_δ layers and the apical oxygen in BaO layers, respectively. The 590 cm^-1 band shifts position slightly with irradiation, and both the intensity and position of the 570 cm^-1 band vary significantly with the laser power. The occupation factor of the interstitial oxygen is sensitive to the annealing temperature. At higher temperatures (550-600°C), both compounds decompose into various (Ba,Cu)-oxides such as Ba_1-xCa_xCuO₂.

Original language	English
Pages (from-to)	126-132
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	251
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(95)00383-5
Publication status	Published - 1995 Sept 1

All Science Journal Classification (ASJC) codes

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

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@article{ccedaaa563cf469baeb3dc8eb1d37556,

title = "Raman study of the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ",

abstract = "We studied the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ at varying laser irradiation power. Each compound has two Raman bands around 570 and 590 cm-1 which are assigned to the vibrations of the interstitial oxygen in HgOδ layers and the apical oxygen in BaO layers, respectively. The 590 cm-1 band shifts position slightly with irradiation, and both the intensity and position of the 570 cm-1 band vary significantly with the laser power. The occupation factor of the interstitial oxygen is sensitive to the annealing temperature. At higher temperatures (550-600°C), both compounds decompose into various (Ba,Cu)-oxides such as Ba1-xCaxCuO2.",

author = "H. Chang and He, {Z. H.} and Meng, {R. L.} and Xue, {Y. Y.} and Chu, {C. W.}",

note = "Funding Information: The authors thank Y.T. Ren for helpful discussions and J.Y. Fan for preparing the figures. HC is grateful to co-authors, especially C.W. Chu, for the hospitality during his visit to the Texas Center for Superconductivity at the University of Houston. This work was supported by USAFOSR F49620-93-1-0310, NSF Grant No. DMR 91-22043 and DARPA Grant No. MDA 972-90-J°1001, the Texas Center for Superconductivity at the University of Houston and the T.L.L. Temple Foundation.",

year = "1995",

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day = "1",

doi = "10.1016/0921-4534(95)00383-5",

language = "English",

volume = "251",

pages = "126--132",

journal = "Physica C: Superconductivity and its applications",

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TY - JOUR

T1 - Raman study of the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ

AU - Chang, H.

AU - He, Z. H.

AU - Meng, R. L.

AU - Xue, Y. Y.

AU - Chu, C. W.

N1 - Funding Information: The authors thank Y.T. Ren for helpful discussions and J.Y. Fan for preparing the figures. HC is grateful to co-authors, especially C.W. Chu, for the hospitality during his visit to the Texas Center for Superconductivity at the University of Houston. This work was supported by USAFOSR F49620-93-1-0310, NSF Grant No. DMR 91-22043 and DARPA Grant No. MDA 972-90-J°1001, the Texas Center for Superconductivity at the University of Houston and the T.L.L. Temple Foundation.

PY - 1995/9/1

Y1 - 1995/9/1

N2 - We studied the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ at varying laser irradiation power. Each compound has two Raman bands around 570 and 590 cm-1 which are assigned to the vibrations of the interstitial oxygen in HgOδ layers and the apical oxygen in BaO layers, respectively. The 590 cm-1 band shifts position slightly with irradiation, and both the intensity and position of the 570 cm-1 band vary significantly with the laser power. The occupation factor of the interstitial oxygen is sensitive to the annealing temperature. At higher temperatures (550-600°C), both compounds decompose into various (Ba,Cu)-oxides such as Ba1-xCaxCuO2.

AB - We studied the thermal stability of HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ at varying laser irradiation power. Each compound has two Raman bands around 570 and 590 cm-1 which are assigned to the vibrations of the interstitial oxygen in HgOδ layers and the apical oxygen in BaO layers, respectively. The 590 cm-1 band shifts position slightly with irradiation, and both the intensity and position of the 570 cm-1 band vary significantly with the laser power. The occupation factor of the interstitial oxygen is sensitive to the annealing temperature. At higher temperatures (550-600°C), both compounds decompose into various (Ba,Cu)-oxides such as Ba1-xCaxCuO2.

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DO - 10.1016/0921-4534(95)00383-5

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VL - 251

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EP - 132

JO - Physica C: Superconductivity and its applications

JF - Physica C: Superconductivity and its applications

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ER -

Raman study of the thermal stability of HgBa₂CaCu₂O_6+δ and HgBa₂Ca₂Cu₃O_8+δ

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