中国物理B ›› 1994, Vol. 3 ›› Issue (5): 366-373.doi: 10.1088/1004-423X/3/5/007

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INFLUENCE OF SPIN AND CHARGE FLUCTUATIONS ON THE HIGH-Tc SUPERCONDUCTIVITY

肖明文, 徐晓华, 李正中   

  1. Department of Physics, Nanjing University, Nanjing 210008, China
  • 收稿日期:1993-07-22 出版日期:1994-05-20 发布日期:1994-05-20
  • 基金资助:
    Project supported in part by the National Natural Science Fouadation of China.

INFLUENCE OF SPIN AND CHARGE FLUCTUATIONS ON THE HIGH-Tc SUPERCONDUCTIVITY

XIAO MING-WEN (肖明文), XU XIAO-HUA (徐晓华), LI ZHENG-ZHONG (李正中)   

  1. Department of Physics, Nanjing University, Nanjing 210008, China
  • Received:1993-07-22 Online:1994-05-20 Published:1994-05-20
  • Supported by:
    Project supported in part by the National Natural Science Fouadation of China.

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摘要： In the framework of the weak coupling theory of superconductivity, we have proved that spin and charge fluctuations in the high-Tc superconductors can pro-duce respectively, pair-breaking and pair-forming effects on the superconductivity resulting from the "generalized BCS mechanism". With the coupling constant for spin fluctuations larger than that for charge fluctuations, they combine to produce a temperature-dependent effective pair-breaking effect, which makes Tc decrease more rapidly than Δ(0), the superconducting gap at T=0, and therefore, enhances the ratio 2Δ(0)/Tc. This provides a reasonable physical interpretation for the relevant experimental results.

Abstract: In the framework of the weak coupling theory of superconductivity, we have proved that spin and charge fluctuations in the high-Tc superconductors can pro-duce respectively, pair-breaking and pair-forming effects on the superconductivity resulting from the "generalized BCS mechanism". With the coupling constant for spin fluctuations larger than that for charge fluctuations, they combine to produce a temperature-dependent effective pair-breaking effect, which makes Tc decrease more rapidly than $\Delta$(0), the superconducting gap at T=0, and therefore, enhances the ratio 2$\Delta$(0)/Tc. This provides a reasonable physical interpretation for the relevant experimental results.

中图分类号: 

  • 74.40.+k
74.20.Fg (BCS theory and its development) 74.25.Jb (Electronic structure (photoemission, etc.)) 74.20.Mn (Nonconventional mechanisms) 74.72.-h (Cuprate superconductors) 74.62.Yb (Other effects)