TY - JOUR
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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U2 - 10.1016/0038-1098(88)91046-0
DO - 10.1016/0038-1098(88)91046-0
M3 - Article
AN - SCOPUS:0024048765
VL - 67
SP - 363
EP - 367
JO - Solid State Communications
JF - Solid State Communications
SN - 0038-1098
IS - 4
ER -