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T(c) suppression in co-doped striped cuprates
C Morais Smith1, A H Castro Neto, A V Balatsky
1Institut de Physique Théorique, Pérolles, CH-1700 Fribourg, Switzerland.
Physical Review Letters
|November 3, 2001
Summary
We developed a model explaining how impurities reduce superconductivity in cuprates by pinning charge stripes. This leads to a linear decrease in critical temperature (T(c)) with increasing impurity concentration, matching experimental data.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Cuprates exhibit complex electronic phases, including charge stripes, which compete with superconductivity.
- Impurity doping is a common method to tune the properties of cuprates, often leading to a suppression of the superconducting critical temperature (T(c)).
Purpose of the Study:
- To propose a theoretical model explaining the reduction of superconductivity in cuprates due to impurity co-doping.
- To investigate the relationship between stripe pinning by impurities and the suppression of the critical temperature (T(c)).
Main Methods:
- Developing a geometrical model based on the planar fraction of carriers affected by stripe pinning.
- Analyzing the scaling behavior of the critical impurity concentration (z(c)) in different stripe regimes.
Main Results:
- A linear suppression of T(c) as a function of impurity concentration (z) was derived.
- The critical impurity concentration (z(c)) for vanishing superconductivity scales with T(2)(c) in the incompressible stripe regime and becomes universal in the compressible regime.
- The model shows excellent agreement with experimental data for various co-doped cuprates.
Conclusions:
- The proposed model successfully explains the T(c) reduction in cuprates caused by stripe pinning.
- The findings provide insights into the interplay between charge order and superconductivity in these materials.
- The theoretical predictions are validated by experimental observations in single- and bilayer cuprates.