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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Debye–Huckel–Onsager Conductance Equation01:28

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The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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In statistics, correlation describes the degree of association between two variables. In the subfield of linear regression, correlation is mathematically expressed by the correlation coefficient, which describes the strength and direction of the relationship between two variables. The coefficient is symbolically represented by 'r' and ranges from -1 to +1. A positive value indicates a positive correlation where the two variables move in the same direction. A negative value suggests a negative...
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In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the other increases, and...
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The correlation coefficient, r, developed by Karl Pearson in the early 1900s, is numerical and provides a measure of strength and direction of the linear association between the independent variable, x, and the dependent variable, y. Hence, it is also known as the Pearson product-moment correlation coefficient. It can be calculated using the following equation:

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Published on: October 9, 2012

Correlation between Raman sum and optical conductivity sum in La(2-x)Sr(x)CuO4.

S Sugai1, J Nohara, R Shiozaki

  • 1Department of Physics, Arts and Science, Petroleum Institute, PO Box 2533, Abu Dhabi, UAE. Department of Physics, Faculty of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 24, 2013
PubMed
Summary
This summary is machine-generated.

In strongly correlated electron systems, Raman spectra reveal incoherent electronic states. These states, linked to magnetic excitations in spin stripes, correlate with optical conductivity.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Strongly correlated electron systems exhibit complex electronic behaviors, including the transformation of single-particle spectral functions into coherent peaks and incoherent humps.
  • These incoherent parts often lose symmetry and momentum (k) dependence, leading to similarities in Raman spectra of different symmetries.

Purpose of the Study:

  • To investigate the relationship between Raman spectra and optical conductivity in strongly correlated electron systems.
  • To analyze the nature and origin of incoherent electronic states in materials like La(2-x)Sr(x)CuO4.
  • To explore the role of magnetic excitations in forming these incoherent states.

Main Methods:

  • Raman spectroscopy measurements on La(2-x)Sr(x)CuO4.
  • Analysis of spectral functions and optical conductivity.
  • Removal of Fleury-Loudon type B1g two-magnon scattering for spectral comparison.
  • Moment analysis of Raman susceptibility and optical conductivity.

Main Results:

  • Raman spectra of different symmetries (B1g and B2g) in La(2-x)Sr(x)CuO4 become identical above 2000 cm(-1) in the underdoped phase after accounting for magnon scattering.
  • A strong correlation was observed between the first Raman susceptibility moment and the generalized optical conductivity moment.
  • This correlation is attributed to incoherent electronic states forming a hump (1000–4000 cm(-1)) in the mid-infrared absorption spectra.
  • The hump's energy is approximately twice the spin wave dispersion segments in the k(perpendicular) stripe direction.

Conclusions:

  • The incoherent electronic states in strongly correlated systems are significantly influenced by magnetic excitations within antiferromagnetic spin stripes.
  • Hole hopping in these spin stripes is a key mechanism for forming these incoherent states.
  • Raman spectroscopy, when analyzed in conjunction with optical conductivity, provides insights into the complex electronic and magnetic properties of these materials.