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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Surprises in the t-J Model: Implications for Cuprates
Aabhaas V Mallik1, Gaurav K Gupta1, Vijay B Shenoy1
1Department of Physics, Center for Condensed Matter Theory, Indian Institute of Science, Bengaluru 560012, India.
Physical Review Letters
|April 28, 2020
Summary
Strongly correlated systems, like cuprate superconductors, exhibit instability in d-wave superconductivity due to fluctuations. This leads to a d+is* superconductor, explaining nodeless superconductivity observed in experiments.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Cuprate superconductors are strongly correlated systems with low dimensionality.
- Enhanced fluctuation effects are significant in these systems but often overlooked.
Purpose of the Study:
- To analyze the t-J model in the slave boson formulation, focusing on underappreciated fluctuation effects.
- To investigate the stability of the d-wave superconducting state in strongly correlated systems.
Main Methods:
- Analysis of the t-J model using the slave boson formulation.
- Focus on internal phase fluctuations within the superconducting state.
Main Results:
- The d-wave superconducting state is unstable to internal phase fluctuations at low doping.
- This instability leads to the formation of a time-reversal broken d+is* superconductor.
- The findings explain the observation of nodeless superconductivity in cuprate superconductors at low doping.
Conclusions:
- Fluctuation effects are crucial in understanding strongly correlated two-dimensional systems.
- The study provides a theoretical explanation for experimental observations in cuprate superconductors.
- Further experiments are proposed to validate these findings and explore broader implications.
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