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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Two-component nematic superconductivity in 4Hb-TaS2.

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|January 27, 2024
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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.

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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.