The Existence of the 60 K Plateau in the YBa_2Cu_3O_{6+y} Phase Diagram: the Role of Oxygen Ordering and Charge Imbalance

• Authors: T. Zaleski , T. Kopeć
• Languages of publication: EN

Abstracts

EN

We propose a semi-microscopic model of YBa_2Cu_3O_{6+y} to investigate the origin of the 60 K plateau in its phase diagram. Our model is a "phase only" approach to the high-temperature superconducting system in terms of collective variables. It is able to capture characteristic energy scales present in YBa_2Cu_3O_{6+y} by using adjustable parameters representing phase stiffnesses and allows for strong anisotropy within basal planes to simulate oxygen ordering. We solve the model calculated T_c for chosen system parameters investigating the influence of oxygen ordering and doping imbalance on the shape of YBa_2Cu_3O_{6+y} phase diagram. Our results suggest that the oxygen ordering alone does not seem to be responsible for the existence of the 60 K plateau. However, relying on experimental data unveiling that oxygen doping of YBa_2Cu_3O_{6+y} may introduce a significant charge imbalance between CuO_2 planes and other sites, we show that simultaneously the former are underdoped, while the latter - strongly overdoped almost in the whole region of oxygen doping in which YBa_2Cu_3O_{6+y} is superconducting. This provides two natural counter acting factors, which possibly lead to rise the 60 K plateau with increasing oxygen doping.

Keywords

EN

74.20.-z; 74.72.Bk; 74.62.-c

Discipline

• 74.20.-z: Theories and models of superconducting state
• 74.62.-c: Transition temperature variations, phase diagrams

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 111
• Issue: 5
• Pages: 705-711

Dates

published

2007-05

Contributors

author

T. Zaleski

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

author

T. Kopeć

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław, Poland

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Identifiers

DOI

10.12693/APhysPolA.111.705