Talk:Curie–Weiss law

This is Abhijit Guria from T.I.F.R.

I will be working on Curie-Weiss Law http://en.wikipedia.org/wiki/Curie-Weiss_law

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References:

- http://www.gitam.edu/eresource/Engg_Phys/semester_2/magnetic/weiss.htm

- Kittel, Charles. Introduction to solid state physics: Chapter 10: FERROMAGNETISM AND ANTIFERROMAGNETISM

- Weiss, Pierre (1907). "L'hypothèse du champ moléculaire et la propriété ferromagnétique". J. Phys. Theor. Appl. 6 (1): 661–690.

- Feynmann Lectures (Vol 2)

- Ashcroft Mermin

- Vleck: The theory of electric and magnetic susceptibility

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Plan:

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1. Putting summary of the following concepts referred to by the existing page to make the page more self-contained:

- magnetic susceptibility - ferromagnet - paramagnetic region - Curie point - Spontaneous magnetization - Mean field approximation

2. Listing some of the classical approaches to magnetic susceptibility and pointing out their limitation using Bohr–van Leeuwen theorem.

https://en.wikipedia.org/wiki/Bohr%E2%80%93van_Leeuwen_theorem

3. Furnishing the details of the derivation of the Curie Law using the density matrix of a 2-state system and Von Neumann's equation (as done in the class during lecture 5).

http://theory.tifr.res.in/~sgupta/courses/qm2013/hand5.pdf

4. Explanation of para and diamagnetism using perturbation theory:

Solid State physics: Ashcroft Mermin

5. Adding spin-spin interaction in the Hamiltonian: Ising model

http://en.wikipedia.org/wiki/Ising_model — Preceding unsigned comment added by Ag33in (talk • contribs) 10:44, 16 October 2014‎


 * Welcome, Abhijit Guria. I look forward to your carrying out this plan. You will find Wiki-style links useful. For example, to link to https://en.wikipedia.org/wiki/Bohr%E2%80%93van_Leeuwen_theorem, you can put double brackets around the article name – Bohr–van Leeuwen theorem – to get Bohr–van Leeuwen theorem. See Manual of Style/Linking for more information. Each of the subjects
 * magnetic susceptibility - ferromagnet - paramagnetism - Curie point - Spontaneous magnetization - Mean field approximation
 * has its own article, so your summaries can be short and to the point. RockMagnetist(talk) 05:12, 17 October 2014 (UTC)

Thank you Mr. RockMagnetist. I will keep your very valuable suggestions in mind while editing this page. Ag33in (talk) 11:38, 26 October 2014 (UTC)

What?
... and then $$ {\displaystyle \chi ={\frac {M\mu _{0}}{B}}\rightarrow {\frac {M\mu _{0}}{B+\lambda M}}={\frac {C}{T}}}{\displaystyle \chi ={\frac {M\mu _{0}}{B}}\rightarrow {\frac {M\mu _{0}}{B+\lambda M}}={\frac {C}{T}}}$$ which can be rearranged to get $$ {\displaystyle \chi ={\frac {C}{T-{\frac {C\lambda }{\mu _{0}}}}}}{\displaystyle \chi ={\frac {C}{T-{\frac {C\lambda }{\mu _{0}}}}}}$$

Is this a joke? 2001:B07:646B:4D36:FDE4:1A7B:6912:9FA0 (talk) 09:28, 11 May 2022 (UTC)