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Related Concept Videos

Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.2K
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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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.2K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.5K
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.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.5K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.3K
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.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.3K
Types Of Superconductors01:28

Types Of Superconductors

1.7K
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...
1.7K
Superconductor01:24

Superconductor

1.9K
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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin-orbit-coupled superconductivity.

Shun-Tsung Lo1, Shih-Wei Lin2, Yi-Ting Wang3

  • 11] Graduate Institute of Applied Physics, National Taiwan University, Taipei 106, Taiwan [2].

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|June 26, 2014
PubMed
Summary
This summary is machine-generated.

This study reveals how spin-orbit interaction influences superconductivity in aluminum nanofilms. We observed magneto-resistivity peaks, demonstrating SO coupling

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Superconductivity and spin-orbit (SO) interaction are distinct fields.
  • Previous studies on SO coupling effects on superconductivity were limited.
  • Direct experimental evidence linking SO coupling and superconductivity was lacking.

Purpose of the Study:

  • Investigate the impact of SO coupling on superconductivity.
  • Explore SO coupling effects in the critical region of superconducting transition.
  • Demonstrate the influence of SO coupling strength on superconducting properties.

Main Methods:

  • Fabrication of aluminum (Al) nanofilms with varying thicknesses.
  • Measurement of magneto-resistivity.
  • Analysis of resistivity peaks above and below the superconducting critical temperature (Tc).
  • Tuning SO coupling strength and spin relaxation via film thickness.

Main Results:

  • Observed clear magneto-resistivity peaks indicating SO coupling above Tc.
  • Noted that resistivity peak line-shape is modified by quasi-two-dimensional superconductivity below Tc.
  • Demonstrated that SO coupling significantly affects superconductivity.

Conclusions:

  • SO coupling plays a crucial role in superconductivity.
  • The study provides direct evidence of SO interaction's influence on superconducting transitions.
  • Findings highlight the interplay between SO coupling, disorder, and superconductivity.