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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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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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All-spinel oxide Josephson junctions for high-efficiency spin filtering.

S Mesoraca1, S Knudde, D C Leitao

  • 1Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 15, 2017
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Summary
This summary is machine-generated.

Researchers developed new spinel-based spin filter devices using lithium titanate electrodes to minimize defects. This approach enables efficient spin filtering, overcoming previous limitations and opening avenues for advanced spintronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Spintronics

Background:

  • High-efficiency spin filtering using spinel ferromagnetic tunnel barriers is crucial for spintronics.
  • Antiphase boundary formation due to lattice mismatch between barriers and electrodes hinders device performance at room temperature.

Purpose of the Study:

  • To demonstrate the use of lithium titanate (LiTi2O4) thin films as electrodes in all-spinel oxide spin filter devices.
  • To minimize antiphase boundary formation and improve spin filtering efficiency.

Main Methods:

  • Fabrication of CoFe2O4-based spin filter devices utilizing LiTi2O4 thin films as electrodes.
  • Characterization of epitaxial quality and antiphase boundary formation.
  • Low-temperature measurements to investigate tunneling and Josephson junction behavior due to the superconducting nature of LiTi2O4.

Main Results:

  • Achieved nearly perfect epitaxy throughout the all-spinel oxide structure, significantly minimizing antiphase boundary formation.
  • Demonstrated the potential for improved spin filtering efficiency by overcoming lattice parameter mismatch issues.
  • Observed superconducting properties in LiTi2O4 electrodes, enabling exploration of quantum phenomena like Josephson junctions.

Conclusions:

  • The use of LiTi2O4 electrodes in CoFe2O4-based spin filters effectively suppresses antiphase boundaries, paving the way for high-efficiency room-temperature operation.
  • The superconducting nature of LiTi2O4 offers unique opportunities for studying quantum transport phenomena in spintronic devices.