Talk:Van der Pauw method

From Wikipedia, the free encyclopedia

Contents


[edit] Removal Of Cleanup Tag

Cleanup tag removed as I believe I have sufficiently cleaned this page up. It still requires some additions (which I plan to do in the next few days) but it is now in a 'clean' state. Blair - Speak to me 05:32, 25 June 2006 (UTC)

[edit] Hall measurements complete

The Hall measurements section is at least complete now, though I have plans for further improvement. Blair - Speak to me 04:44, 7 October 2006 (UTC)

I don't think that this "overall Hall voltage" thing makes sense. You average over incompatible quantities. The only thing that can be averaged is the change of the van der Pauw resistance due to the switch of B, usually abbreviated ΔR13,24 etc. – Torsten Bronger 12:45, 18 January 2007 (UTC)

[edit] Iterative solver

I don't think that this iterative solver works. At least for my values of R it didn't. Apparently, it uses the Banach fixed point theorem and its preconditions are not fulfilled. I recommend to recommend nested intervals for solving the equation. – Torsten Bronger 11:49, 26 January 2007 (UTC)

[edit] Some comments

"The Van der Pauw Method is a commonly used technique, based around the Hall effect" should be changed to "The Van der Pauw Method is a commonly used technique, used to measure resistivity and Hall coefficient".

Van der Pauw's original paper says "sheet resistivity and Hall Effect" throughout the paper, so clearly, Van der Pauw thought that the two things were separable. Moreover, the second part of the sentence states "be successfully completed with a current source and a voltmeter," but the Hall coefficient measurement requires an external magnetic field to induce the Hall Effect in the sample.

The second paragraph seems to be missing a bullet which therefore states "Hall coefficient of the material," since that's the second part of Van der Pauw's paper as well as the second part of the Wikipedia article.

I would suggest "presented" instead of "propounded" since Van der Pauw uses "presented" in his summary. —Preceding unsigned comment added by IRStuff (talk • contribs) 17:50, 23 November 2007 (UTC)

[edit] Iterative solution

It's unclear that an iterative solution is required. Van der Pauw gives an equation for which f is a solution based on Rab,cd and Rbc,da. This would seem to be an easy target for an Excel-based or Mathcad solver.

I would suggest just putting equations 11 and 12 from Van der Pauw's article into the Wikipedia article and let the reader deal with finding a numerical solution for f. —Preceding unsigned comment added by IRStuff (talk • contribs) 18:33, 23 November 2007 (UTC)