High-temperature superconductivity in the generalized negative U Hubbard model

doi:10.1016/0254-0584(95)01570-1

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/27677

請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/27677

題名:	High-temperature superconductivity in the generalized negative U Hubbard model
其他題名:	高溫超導在廣義負U Hubbard模型下之研究
作者:	Kocharian, A. N.;楊棨;Yang, Chi
貢獻者:	淡江大學物理學系
關鍵詞:	Negative U Hubbard Hamiltonian;Mixed valence;Interacting fermions;Bipolaron superconductivity;Phase transitions
日期:	1995-11-05
上傳時間:	2009-12-31 10:36:36 (UTC+8)
出版者:	Elsevier
摘要:	A new mechanism of superconductivity in high-temperature superconducting oxides (HTSCs) with partially occupied electrons in the p and d orbitals is proposed in the generalized negative U Hubbard model, including orbital degeneracy and the strong intra-atomic attraction. Our approach allows also the introduction, in a consistent way, of the orbital mixing (hybridization) between p and d bands (orbitals). The effective anisotropic Heisenberg XYZ model consisting of pseudo-orbital variables is obtained up to second order by small parameters for arbitrary concentration of particles using unitary transformation in the strong interaction limit. The ground-state energy and the partition function are obtained in the generalized mean field approximation by introducing diagonal charge-ordering parameter η and off-diagonal superconducting order parameter Δ. The self-consistent equations are analyzed and the phase diagram in the ground state and at finite temperatures for arbitrary relations between p and d bandwidths (parameter anisotropicity g) are obtained. The competition between superconducting and charge-ordering correlations for spin and orbital variables gives rise to many different pure and intermediate phases. The proposed model elucidates the role of hybridization and orbital variables on the mechanism of HTSC.
關聯:	Materials Chemistry and Physics 42(2), pp.134-137
DOI:	10.1016/0254-0584(95)01570-1
顯示於類別:	[物理學系暨研究所] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
		0Kb	Unknown	317	檢視/開啟
index.html		0Kb	HTML	49	檢視/開啟

在機構典藏中所有的資料項目都受到原著作權保護.

TAIR相關文章

資料載入中.....