Condensed Matter

1103 Submissions

[3] viXra:1103.0098 [pdf] submitted on 23 Mar 2011

The Lady in Baghdad

Authors: Ron Bourgoin
Comments: 3 pages.

What would most of us do with only three hours of electricity per day? Yet that is what Dr. Sabiha Al-Jabbar did when she was working on her PhD in Baghdad. She had to design her experiments so that she could have the results she needed before the lights went out.
Category: Condensed Matter

[2] viXra:1103.0059 [pdf] submitted on 14 Mar 2011

Thermodynamics of Heisenberg Chains Coupled to Phonons

Authors: Rainer W. Kühne
Comments: 107 pages, dissertation, Dr. rer. nat. obtained from the University of Dortmund on 19 July 2001

This PhD thesis examines the thermodynamical properties of spin-1/2 Heisenberg chains which are coupled to Einstein phonons. One result of this study is that these spin-phonon systems undergo a phase transition similar to a spin-Peierls transition (cf. Physical Review B 60 (1999) 12125-12133 and Physical Review B 65 (2002) 144438). Another result is that in the undimerized phase the critical exponent nu depends on both the phonon frequency and the spin-phonon coupling constant. This means that these spin-phonon systems change the universality class continuously with the spin-phonon coupling (cf. arXiv: cond-mat/9912150v1).
Category: Condensed Matter

[1] viXra:1103.0028 [pdf] submitted on 10 Mar 2011

A Wave Equation for Electrons in Graphene

Authors: Ron Bourgoin
Comments: 5 pages.

We accept the statement that “carriers in graphene are described not by the Schrödinger equation” as a challenge to show that electrons in graphene can be described by the Schrödinger equation.
Category: Condensed Matter