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Controllable Rashba spin-orbit interaction in artificially engineered superlattices involving the heavy-fermion
M Shimozawa1, S K Goh2, R Endo1
1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Physical Review Letters
|May 3, 2014
Summary
We engineered novel superconducting superlattices using molecular beam epitaxy. Modulating layer thickness breaks symmetry, tuning superconductivity and weakening pair-breaking effects via Rashba spin-orbit interaction.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- Heavy-fermion superconductors like CeCoIn5 exhibit strong Pauli pair-breaking effects.
- Superlattices offer a platform to engineer novel electronic and magnetic properties.
- Inversion symmetry breaking is crucial for emergent phenomena in condensed matter.
Purpose of the Study:
- To fabricate and investigate a new class of superconducting superlattices.
- To explore the impact of controlled atomic layer thickness modulation on superconducting properties.
- To understand the role of broken inversion symmetry and Rashba spin-orbit interaction in modulating superconductivity.
Main Methods:
- Fabrication of superconducting superlattices using molecular beam epitaxy.
- Controlled atomic layer deposition of CeCoIn5 and YbCoIn5.
- Measurement of temperature and angular dependence of the upper critical field.
Main Results:
- Successful fabrication of CeCoIn5/YbCoIn5 superlattices with tunable layer thicknesses.
- Observation of dramatic changes in the upper critical field behavior due to broken inversion symmetry.
- Evidence for the significant role of Rashba spin-orbit interaction in weakening Pauli pair-breaking.
Conclusions:
- The engineered superlattices exhibit tunable superconducting properties.
- Broken inversion symmetry and Rashba interaction are key to controlling superconductivity in these systems.
- This work provides a pathway for designing novel superconductors with tailored characteristics.
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