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Nodal Cooper-pair stabilized phase dynamics in granular d-wave superconductors
Yogesh N Joglekar1, A H Castro Neto, Alexander V Balatsky
1Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA.
Physical Review Letters
|February 3, 2004
Summary
Nodal Cooper pairs stabilize superconductivity in granular cuprates despite nanoscale inhomogeneities. This d-wave superconductivity remains robust against disorder, with a predicted Josephson-plasmon mode.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Cuprate superconductors exhibit d-wave superconductivity with nanoscale inhomogeneities.
- The robustness of superconductivity in the presence of these inhomogeneities is a key research question.
Purpose of the Study:
- To investigate the dynamics of Josephson coupling in granular d-wave superconductors.
- To understand the influence of nodal Cooper pairs and disorder on superconductivity.
Main Methods:
- Theoretical study of Josephson coupling dynamics.
- Analysis of the effects of nodal Cooper pairs and disorder.
Main Results:
- Nodal Cooper pairs induce a power-law Josephson coupling, stabilizing the superconducting phase.
- D-wave superconductivity in granular arrays shows unexpected robustness against disorder.
- A planar Josephson-plasmon mode is predicted, with frequency dependent on temperature.
Conclusions:
- The findings explain the experimental observation of robust superconductivity in disordered cuprates.
- Nodal Cooper pairs play a crucial role in maintaining superconductivity in inhomogeneous systems.
- The predicted Josephson-plasmon mode offers a potential avenue for further experimental verification.