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

doi:10.1088/1674-1056/21/11/117401

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 T_c(x) characteristics of the YBa₂Cu₃O_6+x high-T_c 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, l_cr, that is required to trigger the charge transfer process. No holes are assumed to have been transferred from chains of length l<l_cr. The calculated T_c(x) dependence is found to be in excellent agreement with the experimentally reported T_c(x). The critical chain length parameter is estimated to be equal to l_cr=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 (l_cr=4). The results obtained out of the proposed model are briefly discussed.

Keywords: YBCO oxygen ordering critical temperature doping

Received: 26 April 2012
Revised: 26 May 2012
Accepted manuscript online:

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

Fund: Project supported by the Ministry of Education and Science of the Republic of Serbia (Grant No. 171027).

Corresponding Authors: V. M. Matic
E-mail: vladimir matic@vektor.net; vmatic@vin.bg.ac.rs

Cite this article:

V. M. Matic, N. Dj. Lazarov, M. Milic A model for the chain-to-plane charge transfer in YBa₂Cu₃O_6+x 2012 Chin. Phys. B 21 117401

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

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A model for the chain-to-plane charge transfer in YBa₂Cu₃O_6+x