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Related Concept Videos

2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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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...
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

2D NMR: Homonuclear Correlation Spectroscopy (COSY)

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Magnetic Correlation Spectroscopy in CrSBr.

Lukas Krelle1, Ryan Tan1, Daria Markina1

  • 1Institute for Condensed Matter Physics, TU Darmstadt, Hochschulstraße 6-8, D-64289 Darmstadt, Germany.

ACS Nano
|September 12, 2025
PubMed
Summary
This summary is machine-generated.

Chromium sulfidobromide (CrSBr) exhibits layer-by-layer magnetic switching, allowing optical identification of magnetic phases. This study correlates optical transitions with magnetic order in CrSBr, revealing insights into its magnetic anisotropy.

Keywords:
CrSBrexcitonslayered antiferromagnetmagnetic semiconductormagneto-opticsvan der Waals materials

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Chromium sulfidobromide (CrSBr) is an air-stable van der Waals semiconductor.
  • It possesses strong magnetic anisotropy, enabling optical phase identification.
  • Exciton interaction with magnetic order is key to its optical properties.

Purpose of the Study:

  • Investigate the magnetic anisotropy of multilayer CrSBr.
  • Correlate magnetic order with optical transitions in emission and absorption.
  • Identify layer-by-layer magnetization switching mechanisms.

Main Methods:

  • Utilized a three-axis vector magnet for CrSBr studies.
  • Analyzed optical emission and absorption spectra.
  • Employed transfer-matrix analysis to correlate reflection and photoluminescence spectra.

Main Results:

  • Observed layer-by-layer magnetization switching via optical changes with applied magnetic field.
  • Found coexistence of ferromagnetic and antiferromagnetic order within the same CrSBr crystal.
  • Correlated distinct optical transitions with magnetic field strength and exciton behavior.

Conclusions:

  • Optical spectroscopy is effective for identifying magnetic phases and anisotropy in CrSBr.
  • Layer-dependent magnetic behavior and phase coexistence are significant findings.
  • Contrasting optical transition behaviors provide a method for correlation.