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Related Concept Videos

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

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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...
643
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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.0K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.0K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

1.2K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
1.2K
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.1K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
1.1K

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Related Experiment Video

Updated: Jun 6, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Order parameter symmetry in superconducting 2H-TaSeS.

K Yadav1, M Lamba1, M Singh1

  • 1School of Physical Sciences, Jawaharlal Nehru University, New Delhi 110067, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 22, 2024
PubMed
Summary
This summary is machine-generated.

This study synthesizes 2H-TaSeS, a novel superconductor with a superconducting transition at 4.15K. Despite coexistence with charge-density waves, it exhibits conventional Type-II superconductivity, not topological superconductivity.

Keywords:
charge density waveflux pinningpenetration depthtopological superconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Physics

Background:

  • Transition metal dichalcogenides are crucial for topological superconductivity research.
  • Investigating novel superconductors is key to understanding exotic electronic phenomena.

Purpose of the Study:

  • To synthesize and characterize single crystals of 2H-TaSeS.
  • To determine the superconducting properties and phase coexistence in 2H-TaSeS.
  • To explore the potential for topological superconductivity in this material.

Main Methods:

  • Single crystal synthesis and characterization.
  • Radiofrequency (RF) penetration depth measurements.
  • Upper critical field measurements.
  • Density Functional Theory (DFT) calculations.
  • Phonon dispersion analysis.

Main Results:

  • Superconducting transition confirmed at 4.15K, coexisting with charge-density wave ordering at 66K.
  • RF penetration depth indicates s-wave superconductivity in the weak-coupling limit.
  • DFT calculations and phonon dispersion confirm the possibility of coexisting superconductivity and charge-density waves.
  • Vortex dynamics were studied, revealing conventional Type-II superconductivity.

Conclusions:

  • 2H-TaSeS is a conventional Type-II superconductor.
  • No evidence for topological superconductivity was found in 2H-TaSeS.
  • The material provides a platform for studying the interplay between superconductivity and charge-density waves.