Spin-polaron pairing and high-temperature superconductivity

Hiroshi Kamimura; Shunichi Matsuno; Riichiro Saito

doi:10.1016/0038-1098(88)91046-0

Spin-polaron pairing and high-temperature superconductivity

Hiroshi Kamimura, Shunichi Matsuno, Riichiro Saito

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

33 Citations (Scopus)

Abstract

We show that in superconducting materials with CuO₂ layers spin-polarons associated with itinerant holes in the e_v band (Cu dz² - Opπ band,) are created by strong intra-atomic exchange interaction (Hund's coupling) with localized dx²-y² holes. Then the interplay of Hund's coupling and superexchange between Cu²⁺(dx²-y²) spins gives rise to an attractive exchange interaction between spin-polarons, which leads to the formation of spin-singlet spin-polarons pairs. This contributes to high temperature superconductivity. By solving an gap equation it is shown that the s-wave pairing reproduces the observed x dependence of T_c as well as the right magnitudes of T_c in (La_1-xSr_x)₂CuO₄ satisfactorily.

Original language	English
Pages (from-to)	363-367
Number of pages	5
Journal	Solid State Communications
Volume	67
Issue number	4
DOIs	https://doi.org/10.1016/0038-1098(88)91046-0
Publication status	Published - 1988 Jul
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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title = "Spin-polaron pairing and high-temperature superconductivity",

abstract = "We show that in superconducting materials with CuO2 layers spin-polarons associated with itinerant holes in the ev band (Cu dz2 - Opπ band,) are created by strong intra-atomic exchange interaction (Hund's coupling) with localized dx2-y2 holes. Then the interplay of Hund's coupling and superexchange between Cu2+(dx2-y2) spins gives rise to an attractive exchange interaction between spin-polarons, which leads to the formation of spin-singlet spin-polarons pairs. This contributes to high temperature superconductivity. By solving an gap equation it is shown that the s-wave pairing reproduces the observed x dependence of Tc as well as the right magnitudes of Tc in (La1-xSrx)2CuO4 satisfactorily.",

author = "Hiroshi Kamimura and Shunichi Matsuno and Riichiro Saito",

note = "Funding Information: Acknowledgements: We would like to thank Nobuyuki Shima and Kenji Shiraishi for providing information on the results of their band structure calculations and for their helpful discussions. This work was supported by a Grant-in-Aid fronl the Ministry of Education, Science and Culture.",

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journal = "Solid State Communications",

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T1 - Spin-polaron pairing and high-temperature superconductivity

AU - Kamimura, Hiroshi

AU - Matsuno, Shunichi

AU - Saito, Riichiro

N1 - Funding Information: Acknowledgements: We would like to thank Nobuyuki Shima and Kenji Shiraishi for providing information on the results of their band structure calculations and for their helpful discussions. This work was supported by a Grant-in-Aid fronl the Ministry of Education, Science and Culture.

PY - 1988/7

Y1 - 1988/7

N2 - We show that in superconducting materials with CuO2 layers spin-polarons associated with itinerant holes in the ev band (Cu dz2 - Opπ band,) are created by strong intra-atomic exchange interaction (Hund's coupling) with localized dx2-y2 holes. Then the interplay of Hund's coupling and superexchange between Cu2+(dx2-y2) spins gives rise to an attractive exchange interaction between spin-polarons, which leads to the formation of spin-singlet spin-polarons pairs. This contributes to high temperature superconductivity. By solving an gap equation it is shown that the s-wave pairing reproduces the observed x dependence of Tc as well as the right magnitudes of Tc in (La1-xSrx)2CuO4 satisfactorily.

AB - We show that in superconducting materials with CuO2 layers spin-polarons associated with itinerant holes in the ev band (Cu dz2 - Opπ band,) are created by strong intra-atomic exchange interaction (Hund's coupling) with localized dx2-y2 holes. Then the interplay of Hund's coupling and superexchange between Cu2+(dx2-y2) spins gives rise to an attractive exchange interaction between spin-polarons, which leads to the formation of spin-singlet spin-polarons pairs. This contributes to high temperature superconductivity. By solving an gap equation it is shown that the s-wave pairing reproduces the observed x dependence of Tc as well as the right magnitudes of Tc in (La1-xSrx)2CuO4 satisfactorily.

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JO - Solid State Communications

JF - Solid State Communications

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Spin-polaron pairing and high-temperature superconductivity

Abstract

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