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Dynamical layer decoupling in a stripe-ordered high-T(c) superconductor.
1Department of Physics, Stanford University, Stanford, California 94305-4060, USA.
Physical Review Letters
|October 13, 2007
Summary
In stripe-ordered electronic systems, superconductivity can arise with a unique wave vector. This leads to vanishing Josephson coupling in specific crystals like La(2-x)Ba(x)CuO(4), explaining observed layer decoupling.
Area of Science:
- Condensed matter physics
- Materials science
- Superconductivity
Background:
- Strongly correlated two-dimensional electronic systems exhibit complex ordered states.
- Stripe order and superconductivity are emergent phenomena in these systems.
- Layered cuprate materials like La(2-x)Ba(x)CuO(4) display intricate electronic behaviors.
Purpose of the Study:
- To investigate the relationship between stripe order and superconductivity in two-dimensional electronic systems.
- To explain the vanishing Josephson coupling in specific layered structures.
- To elucidate the cause of dynamical decoupling observed in transport measurements.
Main Methods:
- Theoretical analysis of superconducting condensate wave vectors.
- Investigation of Josephson coupling in layered materials with specific crystal structures.
- Correlation of theoretical predictions with experimental transport measurements.
Main Results:
- Superconducting condensate can form at a nonzero wave vector, doubling the charge order period.
- Josephson coupling between adjacent planes vanishes identically in systems with specific structures (e.g., La(2-x)Ba(x)CuO(4)).
- This vanishing coupling is proposed as the cause for dynamical decoupling at x = 1/8.
Conclusions:
- The spatial modulation of the superconducting condensate is intrinsically linked to the stripe order.
- Vanishing Josephson coupling provides a mechanism for the observed layer decoupling in certain cuprates.
- This finding offers a new perspective on the interplay between different electronic orders in layered materials.
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