中国物理B ›› 2012, Vol. 21 ›› Issue (11): 117401-117401.doi: 10.1088/1674-1056/21/11/117401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

A model for the chain-to-plane charge transfer in YBa2Cu3O6+x

V. M. Matic, N. Dj. Lazarov, M. Milic   

  1. Laboratory of Theoretical Physics, Institute of Nuclear Sciences "Vinca", Belgrade University, Belgrade 11001, Serbia
  • 收稿日期:2012-04-26 修回日期:2012-05-26 出版日期:2012-10-01 发布日期:2012-10-01
  • 基金资助:
    Project supported by the Ministry of Education and Science of the Republic of Serbia (Grant No. 171027).

A model for the chain-to-plane charge transfer in YBa2Cu3O6+x

V. M. Matic, N. Dj. Lazarov, M. Milic   

  1. Laboratory of Theoretical Physics, Institute of Nuclear Sciences "Vinca", Belgrade University, Belgrade 11001, Serbia
  • Received:2012-04-26 Revised:2012-05-26 Online:2012-10-01 Published:2012-10-01
  • Contact: V. M. Matic E-mail:vladimir matic@vektor.net; vmatic@vin.bg.ac.rs
  • Supported by:
    Project supported by the Ministry of Education and Science of the Republic of Serbia (Grant No. 171027).

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摘要： A model for the chain-to-plane charge transfer is proposed to account for the two plateaus, at 60 K and at 90 K, of the Tc(x) characteristics of the YBa2Cu3O6+x high-Tc superconductor. It is assumed that the number of holes transferred from a CuO chain of length l to two nearby CuO2 sheets is proportional to l (that is, to the number of oxygen atoms in the chain), if the chain length is greater than, or equal to, a certain critical chain length, lcr, that is required to trigger the charge transfer process. No holes are assumed to have been transferred from chains of length l<lcr. The calculated Tc(x) dependence is found to be in excellent agreement with the experimentally reported Tc(x). The critical chain length parameter is estimated to be equal to lcr=11 (eleven oxygen atoms in a chain), which is a greater value than that obtained in the previously proposed model for the chain-to-plane charge transfer (lcr=4). The results obtained out of the proposed model are briefly discussed.

关键词: YBCO, oxygen ordering, critical temperature, doping

Abstract: A model for the chain-to-plane charge transfer is proposed to account for the two plateaus, at 60 K and at 90 K, of the Tc(x) characteristics of the YBa2Cu3O6+x high-Tc superconductor. It is assumed that the number of holes transferred from a CuO chain of length l to two nearby CuO2 sheets is proportional to l (that is, to the number of oxygen atoms in the chain), if the chain length is greater than, or equal to, a certain critical chain length, lcr, that is required to trigger the charge transfer process. No holes are assumed to have been transferred from chains of length l<lcr. The calculated Tc(x) dependence is found to be in excellent agreement with the experimentally reported Tc(x). The critical chain length parameter is estimated to be equal to lcr=11 (eleven oxygen atoms in a chain), which is a greater value than that obtained in the previously proposed model for the chain-to-plane charge transfer (lcr=4). The results obtained out of the proposed model are briefly discussed.

Key words: YBCO, oxygen ordering, critical temperature, doping

中图分类号:  (Effects of disorder)

  • 74.62.En
74.72.Gh (Hole-doped) 74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition) 64.60.Cn (Order-disorder transformations)