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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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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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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...
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Superconductor01:24

Superconductor

1.1K
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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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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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.
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...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.0K
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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Biasing of Metal-Semiconductor Junctions01:27

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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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Superconducting spin valve effect in Co/Pb/Co heterostructures with insulating interlayers.

Andrey A Kamashev1, Nadir N Garif'yanov1, Aidar A Validov1

  • 1Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, Russia.

Beilstein Journal of Nanotechnology
|May 7, 2024
PubMed
Summary
This summary is machine-generated.

Researchers observed a significant spin valve effect in cobalt/lead/cobalt heterostructures, even with oxidized interfaces. Switching magnetization states shifted the superconducting transition temperature (Tc) by 0.2 K, challenging previous assumptions.

Keywords:
ferromagnetinsulator layersproximity effectsuperconducting spin-valvesuperconductor

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Superconductor/ferromagnet (S/F) proximity effects are crucial for spintronic devices.
  • The spin valve effect, modulating critical temperature (Tc) based on magnetization alignment, is typically optimized with clean interfaces.

Purpose of the Study:

  • To investigate the superconducting properties of Co/Pb/Co heterostructures with intentionally oxidized S/F interfaces.
  • To determine if a significant spin valve effect can be achieved despite non-ideal interfaces.

Main Methods:

  • Fabrication of Co/Pb/Co heterostructures with controlled insulating interlayers.
  • Measurement of superconducting critical temperature (Tc) as a function of the relative magnetization orientation of the Co layers.

Main Results:

  • A notable spin valve effect was observed, with a shift in Tc of up to 0.2 K.
  • This effect occurred despite the intentional oxidation of the S/F interfaces, contrary to common expectations.
  • The results confirm earlier findings on oxidized interlayers in F1/S/F2 systems.

Conclusions:

  • Intentionally deteriorated interfaces do not preclude a significant spin valve effect in S/F heterostructures.
  • Oxidized interlayers offer a viable alternative for optimizing superconducting spin valve performance.