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Possible Role of Oxygen Vacancies and Excitonic Mechanism in High Tc Superconducting Oxides
Abstract Superconductivity with very high transition temperatures, Tc, has been observed in pure and doped La2Cu04-y and cuprate perovskites ABa2Cu307-y recently.1 These materials not only have unprecedented Tcs but also other intriquing properties. For example, undoped La2Cu04-y could be metallic, semimetallic, semiconducting, antiferromagnetic, or superconducting and likewise YBa2Cu307-y could be antiferromagnetic semiconducting, metallic with localized moments and superconducting, depending on how the samples are prepared. The key controlling factor appears to be the oxygen content of the materials. In a systematic investigation of the relationship between physical properties and oxygen vacancies in La2Cu04-y, Johnston etal observed the development of antiferromagnetic ordering from a non-magnetic ground state at y = 0 into a state with a Neel temperature of 290 K at y = 0.03.2 We study here theoretically electronic properties of oxygen vacancies in these cuprates and explore their possible contribution to Tc.
Possible Role of Oxygen Vacancies and Excitonic Mechanism in High Tc Superconducting Oxides
Abstract Superconductivity with very high transition temperatures, Tc, has been observed in pure and doped La2Cu04-y and cuprate perovskites ABa2Cu307-y recently.1 These materials not only have unprecedented Tcs but also other intriquing properties. For example, undoped La2Cu04-y could be metallic, semimetallic, semiconducting, antiferromagnetic, or superconducting and likewise YBa2Cu307-y could be antiferromagnetic semiconducting, metallic with localized moments and superconducting, depending on how the samples are prepared. The key controlling factor appears to be the oxygen content of the materials. In a systematic investigation of the relationship between physical properties and oxygen vacancies in La2Cu04-y, Johnston etal observed the development of antiferromagnetic ordering from a non-magnetic ground state at y = 0 into a state with a Neel temperature of 290 K at y = 0.03.2 We study here theoretically electronic properties of oxygen vacancies in these cuprates and explore their possible contribution to Tc.
Possible Role of Oxygen Vacancies and Excitonic Mechanism in High Tc Superconducting Oxides
Hsu, William Y. (author) / Kasowski, Robert V. (author)
Novel Superconductivity ; 373-378
1987-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
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