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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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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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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Unveiling Intrinsic Triplet Superconductivity in Noncentrosymmetric NbRe through Inverse Spin-Valve Effects.

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Niobium-rhenium (NbRe) thin films show potential for spin-triplet superconductivity. Experiments reveal an inverse spin-valve effect, suggesting intrinsic triplet correlations for superconducting spintronics applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Niobium-rhenium (NbRe) is a noncentrosymmetric superconductor.
  • NbRe has been proposed as a candidate for intrinsic spin-triplet pairing.
  • Conclusive evidence for triplet pairing in NbRe is lacking.

Purpose of the Study:

  • To investigate the presence of spin-triplet Cooper pairs in NbRe.
  • To explore NbRe as a material for superconducting spintronics.

Main Methods:

  • Fabrication of Py/NbRe/Py trilayers.
  • Capping trilayers with an antiferromagnetic layer.
  • Conducting magnetic and electrical measurements.

Main Results:

  • Observed an inverse spin-valve effect in the fabricated trilayers.
  • The effect suggests the possibility of equal-spin-triplet superconductivity.
  • The results are attributed to intrinsic triplet correlations of NbRe.

Conclusions:

  • The inverse spin-valve effect in Py/NbRe/Py heterostructures indicates intrinsic triplet correlations in NbRe.
  • NbRe thin films offer a scalable platform for superconducting spintronics.
  • The simple heterostructure design facilitates potential applications.