Talk:Spin glass

Restructure

This article needs some rewriting. It should be structured into a section on experimental facts and another on theoretical findings, i.e.: replica symmetry breaking, TAP equations and all that. I may do it when I find the time... Javirl 15:44, 29 January 2006 (UTC)

Equation not found

I cannot find the free energy expression for the Edwards–Anderson model given at the end of the section, in the given reference. Am I missing it, or is there a page number that can be provided.

Glass transition temperature

I think that the article should refer to glass transition temperature. However it should be added that in spin glass physics the word glass transition refers to a second order phase transition, whereas in glass physics glass transition temperature refers to a slowdown of the kinetics at low temperature.

Confusing

I realize that the subject matter of this article is pretty specialized, but it would be more encyclopedic if it was made a bit clearer to people with no background in physics. It took me a few reads of the first paragraph even to get a basic idea of what a spin glass is. Manderr (talk) 17:02, 9 November 2008 (UTC)

I rewrote the intro; hopefully it's comprehensible now. -- Beland (talk) 15:07, 11 July 2014 (UTC)

Phosphate-Coated Nickel Plate on Frosted Glass

Plate nickel on fluoride-frosted glass. Oxidize the nickel. Protect that with phosphate.

I just had a brain fart that tells me this ceramic material might be useful for something, but whether it's a magnetic recording medium, a phosphor, or a polarized reflector for some specific frequency of light totally eludes me. I really don't have the equipment to do it. For all I know, you could run current along a strip of it and get light out of the perpendicular. Brewhaha@edmc.net 07:17, 17 July 2007 (UTC)

Spin glass, Spin-glass, or Spinglass?

How do you spell this correctly? The article constantly switches between these 3 possibilities. --85 ^[?!] 23:31, 3 September 2010 (UTC)

I've standardised all occurrences in the prose to spin glass, per the title of the article. Brammers (talk/c) 17:10, 25 September 2011 (UTC)

Non-ergodic behavior

This needs to be explained with more clarity. Is it saying that something like the enthalpy of fusion happens at the freezing temperature? -- Beland (talk) 15:18, 11 July 2014 (UTC)

Ergodic means that all states are visited/distributed equally: e.g. the Bernoulli process of a coin toss is ergodic. Non-ergodic means .. they're not. It is usually measured with the participation ratio which is vanishing when ergodic (e.g. high-temperature) and is of order unity when a glass (low temperature). Roughly speaking, the participation ratio counts the number of states that "participate" in the ground state. Someone should add this to the article. 162.204.250.21 (talk) 00:57, 12 August 2019 (UTC)

Oh, here, let me quote: "We decided that the thing to do was to ignore the spatial ordering, that is, to neglect the long-range ordering of spins in space, if any, and instead to look for long-range order in time. Richard Palmer later named this concept "nonergodicity" because it means, when present, that the system does not explore all possible states in the course of time. As the measure of long-range order in time, we introduced q, which is the average correlation between a spin S, measured at one time and the same spin measured a macroscopic time t later. The equations are ..." 162.204.250.21 (talk) 02:31, 12 August 2019 (UTC)

Gardner transition merge

I think this was originally proposed as a very specific theoretical transition within a generalized Sherrington-Kirkpatrick model of a spin glass. There are some indications this is more broadly applicable [1] but it's not really clear to me how much. As it stands, the content of gardner transition would easily fall within the scope of spin glass, but might not if the article was a more complete treatment. I'm proposing merge here partly to get visibility for an orphaned article, and to better define the scope to see if merging is a good idea. $\langle$ Forbes₇₂ | Talk $\rangle$ 16:23, 8 June 2020 (UTC)