Susceptibility Definition and 69 Threads

Hi, I'm not sure if I have Fourier transformed the expression correctly For the Fourier transformation, I used the following formula ##\int_{-\infty}^{\infty} f(t) e^{i \omega t}dt## $$\frac{4 \pi d_0^2}{\hbar}\int_{-\infty}^{\infty} \sin(\omega_0(t-t')) e^{i \omega t}dt$$ $$\frac{4 \pi...

##\alpha## is considered to be the absorption coefficient for a beam of light of maximum intensity ##I_0##. It's related to the complex part of the refractive index as we have shown above. Now, I have a doubt. Should I solve for ##k## from the quadratic equation in terms of the linear optical...

I've attached images showing my progress. I have used Maxwell relations and the definitions of ##\alpha##, ##\kappa## and ##c##, but I don't know how to continue. Can you help me?

I have not studied the Fourier transform (FT) in great detail, but came across a problem in electrodynamics in which I assume it is needed. The problem goes as follows: Evaluate ##\chi (t)## for the model function...

Dear All short explanation: I am trying to leverage my limited understanding of representation theory to explain (to myself) how many non-vanshing components of, for example, nonlinear optical susceptibility tensor ##\chi^{(2)}_{\alpha\beta\gamma}## can one have in a crystal with known point...

Hi. I've just learned about enumerating the second-order susceptibility (rather blindly) by 3^3 * (3*2*1) * 2 = 324. (tensor size * 3 frequency permutation * negative frequency) I'm guessing that for the third-order susceptibility would similarly yeild 3^4 * (4*3*2*1) * 2 = 3888? I couldn't...

A complete table of the ac susceptibility ## \chi_m ## of various ferromagnetic materials, where ## M=\chi_m H ##, is something that I have had trouble finding in a google of ferromagnetic materials. In what I have been able to come up with to date, there is quite a spread in the values of...

Homework Statement A certain magnetic system contains n independent molecules per unit volume, each of which has four energy levels given by 0, ##Δ-gμ_B B##, ##\Delta##, ##\Delta +gμ_B B##. Write down the partition function, compute Helmholtz function and hence compute the magnetization ##M##...

Homework Statement The susceptibility of a simple metal has a contribution ##\chi_{c.c}## from the conduction electrons and a contribution ##\chi_{ion}## from the diamagnetic response of the closed-shell core electrons. Taking the conduction electron susceptibility to be given by the free...

Homework Statement I'm am trying to find out the magnetic susceptibility,XM in order to calculate the number of unpaired electrons in Mn(acac)3 via the Evans Method Homework Equations XM = (477) Δv/(Qv1C) XM= X'm+ XM(metal)+ XM (ligands) Where X'M is the magnetic susceptibilty of just the...

Hello everybody, My question is about nonlinear optic in both macroscopic and microscopic point of view. What is the relationship between second order susceptibility tensor \chi^{(2)} and the first hyperpolarizability tensor \beta ? Thank you everybody. Konte.

Homework Statement Use the complex susceptibility to prove that the dot product of E and J is related to the absorption term (the imaginary part - χ'') and independent of the real part (χ'). It is also stated that in order to do is, assume monochromatic field and take the absorption time...

Homework Statement Hi, I have some data taken on voltage and resistance of a coil part of a yttrium barium copper oxicde (ycbo) superconductor. I have no information about the coil itself. A thermocouple attached to the superconductor also measured the temperature of it as it was cooled. This...

Hello all, new here but plan to stick around for a while. I am currently trying to make a sensor that can detect if a material below it is paramagnetic. I believe paramagnetic is the proper term, but it needs to detect if the force exerted by permanent magnet is above a certain threshold. The...

Hi I'm trying to find the difference between magnetic susceptibility and permeability? Do they both mean the same thing? If not, can anyone clear things up for me?

Hi there, I'm having a little trouble understanding the "distinguishability" of frequencies in the nonlinear electric susceptibility tensor. As far as I understand, if we have a SHG process with two collinear beams of the same polarization and frequency ω, there is only one susceptibility...

Hey, sorry if this is in the wrong section. I am looking for a tabulated value magnetic susceptibility of some metal salts; Sodium thiosulfate in particular. Could someone point me in the right direction? Thanks

I have read a book that demonstrate the origin of electrical susceptibility of high order in harmonic generation: (in Robert Boyd's book : "Nonlinear optics"). For example, he show clearly for the case of second harmonic generation, how \chi^{(2)} depends on matrix element of electric dipole...

Homework Statement (a) Show the curie-weiss behaviour. (b) Estimate ##\lambda## and ##B_e## and exchange energy.[/B] Homework EquationsThe Attempt at a Solution Part(a) Since even when applied field is zero, ##B_{total} \neq 0## which gives rise to ##M\neq 0##. This is a fundamental...

Homework Statement Part(a): Derive susceptibility Part(b): Find field experienced by neighbour. Part(c): State temperature range. What explains temperature dependence beyond curie temperature? Why is curie temperature so high? Part(d): In practice, measured magnetic moment is far lower than...

Hi everybody, In Robert W. Boyd's book "Nonlinear Optics", the quantum treatment of the nonlinear optical susceptibility lead to the next expression, for the second order case: \chi^{(2)}_{ijk}(\omega_{\sigma},\omega_q,\omega_p)=\frac{N}{\hbar^2} P_F\sum_{mn}...

I am confused about the magnetic susceptibility vs. temperature curves (or MT) of superconductors (SCs). In the normal conduction state (I measured from 4.5K to 300K), the susceptibility curve can obey the Curie-Weiss law. But when I fitted the data via the Curie-Weiss law in a different...

Hello, This is really more of an algebra question. Here is the main integral I am using for the susceptibility V\chi_0=\frac{d\langle...

Homework Statement Show that the real and imaginary parts of the following susceptibility function satisfy the K-K relationships. Use the residue theorem. $$ \chi(\omega) = \frac{\omega_{p}^2}{(\omega_0^2-\omega^2)+i\gamma\omega} $$ Homework Equations The Kramers-Kronig relations are $$...

The medical industry is starting to move towards miniature implanted electronic devices for monitoring the body, automatically delivering drugs to the body, and tracking senile patients. My question is , aren't these vulnerable to EMP , In a nuclear attack patients would have their drug...

This is defined by M=XmH. Using H=(B/u0)-M to eliminate M gives us M=1/u0(Xm/1+Xm)B, where B is the total magnetic field. Now my problem is, my book states that for paramagnetic media, Xm is positive, and for diamagnetic media Xm is negative. Now for paramagnetism, we expect M and B to have...

Hi, everyone. I am having a hard time finding explicit values of non-linear susceptibility tensor values for any sort of crystals. Specifically, I'm looking for values of a BBO crystal, but I would like to know where to find others for my future research. I should say that I am looking for the...

[SIZE="4"]Definition/Summary Susceptibility is a property of material. In a vacuum it is zero. Susceptibility is an operator (generally a tensor), converting one vector field to another. It is dimensionless. Electric susceptibility \chi_e is a measure of the ease of polarisation of a...

revision already calculated J to be 15/2 have already found g to be 1.33 M = ngμJ magnetic suseptibilty is 5X10^-7 m^3/mol please could omeone tell me if it is possible to calculate the magnetic susceptibility from the above information? thanks in advance for an pointers.

My book says that "in the mean field approximation, the isothermal magnetic susceptibility just below the Curie temperature goes as ##(T_c-T)^{-1}##". I need some help understanding how to get this proportionality. My book does not contain any derivation or further explanations. According to...

Hello everyone I just want to ask why In a centrosymmetric media the media doe not change why going from r to -t r is a position vector thus Second order susceptibility becomes zero ?? Thank you

Homework Statement find the derivation of χm=μr-1 where Xm is the magnetic susceptibility and μ is the relative permeability. Homework Equations M=Xm.H M is the magnetization,H is the magnetic field μr=μ/μo where μo is the permeability of a vacuum, The Attempt at a Solution I...

The simplest model for calculating electric susceptibility of dielectrics,is a driven oscillation of an electric dipole with a resistive force proportional to its velocity.Its equation is like below: m\ddot{x}+\gamma \dot{x}+kx=-eE We know that the restoring force is the same force binding...

I'm curious what models there are for calculating the Electric Susceptibility in crystalline solids and any books that describe maxwell equations in solids well. I'm interested in how to predict index of refraction of materials and the texts are a bit above my head as I haven't really dealt with...

What is the difference between the two and what are the applications of them in a magnetic material?

Hi everyone I'm about to undertake my final year project and i will be researching and writing on THE EFFFCT OF HEAT ON THE MAGNETIC SUSCEPTIBILITY OF TOPSOIL and how it relates to SOIL FERTILITY.. I really need help on how to go about it and i'll also need links on contemporary...

So for dielectrics, electric susceptibility (χ) is just the relative permittivity of the dielectric (κ) minus one? => χ = κ -1? Why? Doesn't this mean χ is a completely pointless constant? Just a different way to write κ?

[Wasn't sure if each problem needed a separate post. Please feel free to edit if needed.] Also \~ and \^ are tilde and hat respectively. 1a. Homework Statement Use perturbation theory to derive the 3rd order nonlinear susceptibility \chi^{(3)}(3w;w,w,w) (problem gives potential energy, etc...

Hi! I'm trying to calculated the magnetic susceptibility of a solution. I am using this table to know what the susceptibility of each substance is. In other words, I want to know how the magnetic susceptibilities of two (or more) substances add up once they are mixed together into a solution. I...

Homework Statement For the same kind of atoms, if a solid is formed from a gas, is the susceptibility increased or decreased compared to the gas phase ? Why ? Homework Equations Susceptibility of a gas is given as χ=N/V * α where N/V is average particle density and α is the...

1. Good day, Using 4-inch pole caps and a Mettler M5 balance, I got all the values required in order to calculate the magnetic susceptibility of several inorganic compounds such as Manganese (IV) oxide (MnO2). I have the change in mass of the tube with the sample of the compound when the...

Intensity of magnetisation(I) is defined as the magnetic moment per unit volume of the material. It represents the extent to which a specimen is magnetised. I=M/V Magnetising force or magnetising intensity(H) is defined as the number of ampere turns flowing round unit length of toroidal...

Hi, I have been working through lecture notes of a condensed matter field theory class, and unfortunately I haven't found references for some of the specialized calculations though the way they're done makes them seem common knowledge in the cond-mat community. I have started this thread...

Are you aware of typical magnetic susceptibility values for ferrofluids? I've had no luck searching for numerical values.

Can anyone link me to a table of a large amounts of different compounds with the magnetic susceptibility of each one? Thanks.

can anyone tell me abt magnetic susceptibility of fruits, vegetables, and herbs?, and related research papers

I got a little confused of these three things by my teacher and Griffiths. I am acquaintanced with Feynman's lectures on physics and what I get from there is \epsilon=\epsilon_{r}\epsilon_{0} = \left(1+\chi\right)\epsilon_{0} For some reason Griffiths, as well as my teacher, likes to use...

Fairly simple question: If a highly permeable material (of any shape) is placed in a uniform magnetic field, will the material's magnetization density always line up with the uniform magnetic field, or do I have to take into account the fields that are created as the material becomes...

I've wondered this for a while: Can you decrease your susceptibility to decisioning yourself by becoming aware of self-deceptive practices? The reason this is not an open-and-shut case is because cognitive biases are unconscious, and therefore they cannot be consciously self-examined. In fact...

Hi all, I'm Luca from Italy. This is the technical setting. Assuming we have a compass/magnetometer placed on something of general shape and material. The magnetometer feels the Earth's magnetic field that we call H_earth: we know, however, that the field measured by the...