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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
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Singlet-triplet conversion and the long-range proximity effect in superconductor-ferromagnet structures with generic
1Centro Mixto CSIC-UPV/EHU, Centro de Física de Materiales (CFM-MPC), Manuel de Lardizabal 4, E-20018 San Sebastián, Spain and Donostia International Physics Center (DIPC), Manuel de Lardizabal 5, E-20018 San Sebastián, Spain and Institut für Physik, Carl von Ossietzky Universität, D-26111 Oldenburg, Germany.
Physical Review Letters
|August 29, 2014
Summary
Researchers discovered new mechanisms for the long-range proximity effect (LRPE) in superconductor-ferromagnet (S/F) nanostructures. This effect, crucial for triplet Cooper pairs, can occur without magnetic inhomogeneities, opening new research avenues.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- The long-range proximity effect (LRPE) in superconductor-ferromagnet (S/F) hybrid nanostructures is vital for understanding Cooper pair behavior.
- It is widely accepted that magnetic inhomogeneities are necessary for the conversion of singlet to triplet Cooper pairs, enabling LRPE.
Purpose of the Study:
- To investigate alternative mechanisms for generating the long-range triplet component (LRTC) of the condensate in S/F systems.
- To establish general conditions for the occurrence of LRTC beyond magnetic inhomogeneities.
Main Methods:
- Theoretical analysis of S/F hybrid nanostructures.
- Derivation of a SU(2) covariant diffusive equation for the condensate.
- Modeling systems with exchange fields and spin-orbit coupling as an effective SU(2) potential.
Main Results:
- Demonstrated that an effective SU(2) electric field, not just magnetic inhomogeneities, can drive the LRPE.
- Established a universal condition for the occurrence of LRTC in generic ferromagnets.
- Revealed a novel connection between LRTC and Yang-Mills electrostatics.
Conclusions:
- The study expands the understanding of LRPE in S/F structures by identifying new sources for LRTC.
- The findings suggest new strategies for designing and exploring S/F hybrid materials with tailored quantum properties.
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