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Published on: August 2, 2019
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Two-component nematic superconductivity in 4Hb-TaS2
I Silber1, S Mathimalar2, I Mangel3
1School of Physics and Astronomy, Tel - Aviv University, Tel Aviv, 69978, Israel.
Nature Communications
|January 27, 2024
Summary
Researchers studied the rare chiral superconductor 4Hb-TaS2, revealing evidence of two-component superconductivity. This finding offers insights into unconventional superconductors and coexisting charge order.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Superconductivity typically involves a single-component order parameter, explained by standard Bardeen-Cooper-Schrieffer (BCS) theory.
- Unconventional superconductors with multiple-component order parameters are rare and poorly understood.
Purpose of the Study:
- Investigate the candidate chiral superconductor 4Hb-TaS2.
- Determine the nature of its superconducting order parameter.
- Explore the coexistence of superconductivity with other electronic orders.
Main Methods:
- Utilized scanning tunneling microscopy (STM) to probe local electronic properties.
- Employed angle-resolved macroscopic transport measurements.
- Analyzed superconducting critical fields (Hc2) and vortex core structures.
Main Results:
- Observed quasi-periodic one-dimensional modulations in tunneling conductance.
- Identified a two-fold symmetric superconducting critical field (Hc2), indicating nematicity.
- Found an isotropic vortex core at low temperatures, contrasting with the nematic behavior.
- Proposed a model involving competing chiral and nematic order parameters, with time-reversal symmetry breaking.
Conclusions:
- Provided strong evidence for two-component superconductivity in 4Hb-TaS2.
- Reconciled the apparent discrepancy between nematicity and isotropic vortex cores.
- Offered insights into systems exhibiting coexisting charge order and superconductivity.
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